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• Successful login with iscsiadm on target still doesn't create block device

  - by Halfgaar

  I've set up an experiment to test iscsitarget and initiator, which at some point worked. Later, I turned the setup back on and much to my dismay, the initiator machine stopped making block devices for its successful logins. As far as I know, I haven't changed anything on either machine. Some details: # iscsiadm -m node --login Logging in to [iface: default, target: iqn.2010-12.nl.ytec.arbiter:arbiter.lun1, portal: 10.0.0.1,3260] Logging in to [iface: default, target: iqn.2010-12.nl.ytec.arbiter:arbiter.lun2, portal: 10.0.0.1,3260] Login to [iface: default, target: iqn.2010-12.nl.ytec.arbiter:arbiter.lun1, portal: 10.0.0.1,3260]: successful Login to [iface: default, target: iqn.2010-12.nl.ytec.arbiter:arbiter.lun2, portal: 10.0.0.1,3260]: successful Sessions: # iscsiadm -m session tcp: [3] 10.0.0.1:3260,1 iqn.2010-12.nl.ytec.arbiter:arbiter.lun1 tcp: [4] 10.0.0.1:3260,1 iqn.2010-12.nl.ytec.arbiter:arbiter.lun2 Netstat: # netstat -n -p|grep 3260 tcp 0 0 10.0.0.2:48719 10.0.0.1:3260 ESTABLISHED 1078/iscsid tcp 0 0 10.0.0.2:48718 10.0.0.1:3260 ESTABLISHED 1078/iscsid /var/log/syslog doesn't give errors: Jan 27 11:41:49 vmnode001 kernel: [ 378.041749] scsi7 : iSCSI Initiator over TCP/IP Jan 27 11:41:49 vmnode001 kernel: [ 378.044180] scsi8 : iSCSI Initiator over TCP/IP lsscsi doesn't show my devices: [0:0:1:0] cd/dvd TSSTcorp DVD-ROM TS-L333A D100 /dev/sr0 [4:0:0:0] disk ATA Hitachi HUA72105 A74A - [4:0:1:0] disk ATA Hitachi HUA72105 A74A - [4:1:0:0] disk Dell VIRTUAL DISK 1028 /dev/sda And there are no block devices in /dev for it: # ls -1 /dev/sd* /dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sda4 I tried loading all scsi kernel modules I could find, but that doesn't seem to be the problem. I reall don't get this; it used to work. I found people with similar problems (here and here) but no solution. Initiator is Debian Sqeeuze (testing), target is Debian Lenny (stable). iscsitarget is 0.4.16+svn162-3.1+lenny1, open-iscsi (initiator) is 2.0.871.3-2squeeze1. Target kernel: 2.6.26-2-amd64, initiator kernel: 2.6.32-5-amd64

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• Why is my filesystem being mounted read-only in linux?

  - by Tim

  I am trying to set up a small linux system based on Gentoo on a VirtualBox machine, as a step towards deploying the same system onto a low-spec Single Board Computer. For some reason, my filesystem is being mounted read-only. In my /etc/fstab, I have: /dev/sda1 / ext3 defaults 0 0 none /proc proc defaults 0 0 none /sys sysfs defaults 0 0 none /dev/shm tmpfs defaults 0 0 However, once booted /proc/mounts shows rootfs / rootfs rw 0 0 /dev/root / ext3 ro,relatime,errors=continue,barrier=0,data=writeback 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 udev /dev tmpfs rw,nosuid,relatime,size=10240k,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620 0 0 none /dev/shm tmpfs rw,relatime 0 0 usbfs /proc/bus/usb usbfs rw,nosuid,noexec,relatime,devgid=85,devmode=664 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0 (the above may contain errors: there's no practical way to copy and paste) The partition at /dev/hda1 is clearly being mounted OK, since I can read all the data, but it's not being mounted as described in fstab. How might I go about diagnosing / resolving this? Edit: I can remount with mount -o remount,rw / and it works as expected, except that /proc/mounts reports /dev/root mounted at / rather than /dev/sda1 as I'd expect. If I try to remount with mount -a I get mount: none already mounted or /sys busy mount: according to mtab, sysfs is already mounted on /sys Edit 2: I resolved the problem with mount -a (the same error was occuring during startup, it turned out) by changing the sysfs and proc lines to proc /proc proc [...] sysfs /sys sysfs [...] Now mount -a doesn't complain, but it doesn't result in a read-write root partition. mount -o remount / does cause the root partition to be remounted, however.

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• Finding a shared HDD attached to the network from my F-13 machine

  - by Ramy

  Sorry for the slew of n00bie questions, but here is one more. I recently partitioned my 1.5TB harddrive according to this question I then bought this to attach the harddrive to my network. The problem is, how do I navigate to the hard drive to move files over the network to the HDD. should this be moved to serverfault? update: the disk isn't even showing up when i call "fdisk -l" (as root). How can I mount it if I can't even find it? [root@Moonface ~]# /sbin/fdisk -l Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00018598 Device Boot Start End Blocks Id System /dev/sda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 19458 155777024 8e Linux LVM Disk /dev/dm-0: 53.7 GB, 53687091200 bytes 255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-0 doesn't contain a valid partition table Disk /dev/dm-1: 4764 MB, 4764729344 bytes 255 heads, 63 sectors/track, 579 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-1 doesn't contain a valid partition table Disk /dev/dm-2: 101.0 GB, 101032394752 bytes 255 heads, 63 sectors/track, 12283 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-2 doesn't contain a valid partition table

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• Adding third disk as a single disk in a server with an existing RAID1

  - by slowhandsolo

  I've got a ProLiant DL360 G5 server (Fedora 13) with two SAS disks in a hardware RAID 1, working fine. Now I hot plugged another SAS disk. I'd like to configure this new hard disk out of my RAID, as a single non-RAID disk (ex. /dev/sdb). Even after rebooting the server, I can't see the new disk with "fdisk -l". It displays only my hardware RAID, but not the new disk. [root@myserver]# fdisk -l Disco /dev/cciss/c0d0: 300.0 GB, 299966445568 bytes Disposit. Inicio Comienzo Fin Bloques Id Sistema /dev/cciss/c0d0p1 * 1 126 512000 83 Linux /dev/cciss/c0d0p2 126 71798 292422656 8e Linux LVM Disco /dev/dm-0: 234.9 GB, 234881024000 bytes Disco /dev/dm-1: 10.5 GB, 10536091648 bytes Disco /dev/dm-2: 21.0 GB, 20971520000 bytes Disco /dev/dm-3: 31.5 GB, 31474057216 bytes Disco /dev/dm-4: 1577 MB, 1577058304 bytes However, I can see the new disk using the HP Array Configuration Utility CLI for Linux "hpacucli": [root@myserver]# hpacucli => controller slot=0 physicaldrive all show status physicaldrive 1I:1:1 (port 1I:box 1:bay 1, 300 GB): OK physicaldrive 1I:1:2 (port 1I:box 1:bay 2, 300 GB): OK physicaldrive 1I:1:3 (port 1I:box 1:bay 3, 300 GB): OK => controller slot=0 pd all show detail Smart Array P400i in Slot 0 (Embedded) array A physicaldrive 1I:1:1 Port: 1I Box: 1 Bay: 1 physicaldrive 1I:1:2 Port: 1I Box: 1 Bay: 2 **unassigned** physicaldrive 1I:1:3 Port: 1I Box: 1 Bay: 3 Status: OK Drive Type: **Unassigned Drive** As you can see, I've got two SAS disks in a RAID 1 and the new disk as "unassigned". Is there any way to work with the new disk as another non-RAID single disk? If relevant, I want to create a new partition in my new disk, format it with mkfs and mount it, but as I can't see it with fdisk, I don't know how to do it. Thanks!

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• RHEL Java Application returns "No space left on device" but only 3% used

  - by FiveO

  My Java Application returns following Exception when saving a new file in /opt/wso2 on a CentOS 6.4: Caused by java.io.FileNotFoundException: ... (No space left on device) Caused by: java.io.FileNotFoundException: /opt/wso2/FrameworkFiles/trk_2014062500042488825_TRCK_PatfallHospis_pFromHospis_66601fb3-a03c-4149-93c3-6892e0a10fea.txt (No space left on device) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:212) at java.io.FileOutputStream.<init>(FileOutputStream.java:99) at com.avintis.esb.framework.adapter.wso2.FrameworkAdapterWSO2.sendMessages(FrameworkAdapterWSO2.java:634) ... 23 more But when I run df -a I can see that the partition still has plenty of space available: [root@stzsi466 wso2]# df -a Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_stzsi466-lv_root 12054824 2116092 9326380 19% / proc 0 0 0 - /proc sysfs 0 0 0 - /sys devpts 0 0 0 - /dev/pts tmpfs 4030764 0 4030764 0% /dev/shm /dev/sda1 495844 53858 416386 12% /boot /dev/sdb1 51605436 1424288 47559744 3% /opt/wso2 none 0 0 0 - /proc/sys/fs/binfmt_misc [root@stzsi466 ~]# df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/vg_stzsi466-lv_root 765536 45181 720355 6% / tmpfs 1007691 1 1007690 1% /dev/shm /dev/sda1 128016 44 127972 1% /boot /dev/sdb1 3276800 6137 3270663 1% /opt/wso2 What is the problem here? Is it caused by the Java on CentOS 6.4? I have another server running Redhat REHL 6.4 and all works fine - same Java etc. Does anyone know of this problem?

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• dd on entire disk, but do not want empty portion

  - by Jonathan Henson

  I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0000e4b5 Device Boot Start End Blocks Id System /dev/sda1 * 1 27 209920 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 27 525 4000768 5 Extended Partition 2 does not end on cylinder boundary. /dev/sda5 27 353 2621440 83 Linux /dev/sda6 353 405 416768 83 Linux /dev/sda7 405 490 675840 83 Linux /dev/sda8 490 525 282624 83 Linux I need to make an image to store on our file server for use in flashing other devices we are manufacturing so I only want the used space (only about 4gb). I want to keep the mbr etc... as this device should be boot ready as soon as the copy is finished. Any ideas? I previously had been using dd if=/dev/sda of=[//fileserver/file], but at that time, my master copy was on a 4gb flash ide.

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• Fixing damaged partition table

  - by dr4cul4

  This is continuation of Recover Extended Partition , but this time I have different problem related partition table it self. I managed to restore partition that I needed and backed up files that were crucial to me (at least those that I had space to store somewhere) OK now get to the problem. My partition table is corrupted, booting RIP Linux I can mount it in truecrypt (and other ones that recovered), but that's basically it. When I launch GParted I have unallocated drive. GParted Dev info: Device Information Model: ATA ST2000DL003-9VT1 Size: 1.82TiB Path: /dev/sda Partition table: unrecognized Heads: 255 Sectors/track: 63 Cylinders: 243201 Total Sectors: 3907029168 Sector size: 512 When I check information on unallocated space I get: File system: unallocated Size: 1.82TiB First sector: 0 Last sector: 3907029167 Total sectors: 3907029168 Warning: Can't have a partition outside the disk! Now the output of testdisc (Analyze): TestDisk 6.13, Data Recovery Utility, November 2011 Christophe GRENIER <[email protected]> http://www.cgsecurity.org Disk /dev/sda - 2000 GB / 1863 GiB - CHS 243201 255 63 Current partition structure: Partition Start End Size in sectors > 1 P Linux 13132 242 39 16353 233 8 51744768 2 E extended LBA 16807 223 1 243201 254 63 3637021626 No partition is bootable 5 L Linux 16807 223 57 20430 39 25 58191872 X extended 20430 70 1 243201 78 13 3578816632 Invalid NTFS or EXFAT boot 6 L HPFS - NTFS 20430 71 58 243201 78 13 3578816512 6 LNext Now fdisk: # fdisk -l /dev/sda Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00039cd0 Device Boot Start End Blocks Id System /dev/sda1 210980864 262725631 25872384 83 Linux /dev/sda2 270018504 3907040129 1818510813 f W95 Ext'd (LBA) /dev/sda5 270018560 328210431 29095936 83 Linux /dev/sda6 328212480 3907028991 1789408256 7 HPFS/NTFS/exFAT Now I would like to fix that to arrange partitions correctly, but I have no idea which tool is capable of fixing that (tried, a few, some of them offered fixing, but it was to risky at the moment - still backing up data).

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• Assembling Software RAID in Live CD for data recovery

  - by Maletor

  I need help recovering some data that's on my RAID which is on a LVM on my server running Ubuntu. What happened was I deleted the logical volume that controlled my swap space which was on a partition on drives sda2, sdb2, sdc2, and sdd2 in RAID1. This foobared my whole system for one reason or another. Booting leave me with grub rescue and an error saying that it is an unknown filesystem. When I boot to a live cd I can see my RAID arrays and I can even start them up. However, it doesn't appear to mount them anywhere so I can't see the data. I am in the live cd now and I have done sudo apt-get install mdadm lvm2 so it should be mounting them correctly. I just can't see why it wouldn't. Please any help is appreciated here. Here is some output. By the way, there are 3 RAIDs, 1) /boot 100mb RAID1, 2) swap 10gb RAID1, 3) root 990GB RAID5 ubuntu@ubuntu:~$ df -h Filesystem Size Used Avail Use% Mounted on aufs 124M 101M 18M 86% / none 2.0G 324K 2.0G 1% /dev /dev/sde1 2.0G 826M 1.2G 42% /cdrom /dev/loop0 667M 667M 0 100% /rofs none 2.0G 164K 2.0G 1% /dev/shm tmpfs 2.0G 28K 2.0G 1% /tmp none 2.0G 92K 2.0G 1% /var/run none 2.0G 0 2.0G 0% /var/lock none 2.0G 0 2.0G 0% /lib/init/rw /dev/md1 91M 73M 15M 84% /media/5ac3dbf1-a6c5-409c-96ae-edc6e27992c7 ubuntu@ubuntu:~$ cat /etc/fstab aufs / aufs rw 0 0 tmpfs /tmp tmpfs nosuid,nodev 0 0 /dev/sda2 swap swap defaults 0 0 /dev/sdb2 swap swap defaults 0 0 /dev/sdc2 swap swap defaults 0 0 /dev/sdd2 swap swap defaults 0 0

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• How to delete removed devices from a mdadm RAID1?

  - by Kabuto

  I had to replace two hard drives in my RAID1. After adding the two new partitions the old ones are still showing up as removed while the new ones are only added as spare. I've had no luck removing the partitions marked as removed. Here's the RAID in question. Note the two devices (0 and 1) with state removed. $ mdadm --detail /dev/md1 mdadm: metadata format 00.90 unknown, ignored. mdadm: metadata format 00.90 unknown, ignored. /dev/md1: Version : 00.90 Creation Time : Thu May 20 12:32:25 2010 Raid Level : raid1 Array Size : 1454645504 (1387.26 GiB 1489.56 GB) Used Dev Size : 1454645504 (1387.26 GiB 1489.56 GB) Raid Devices : 3 Total Devices : 3 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Tue Nov 12 21:30:39 2013 State : clean, degraded Active Devices : 1 Working Devices : 3 Failed Devices : 0 Spare Devices : 2 UUID : 10d7d9be:a8a50b8e:788182fa:2238f1e4 Events : 0.8717546 Number Major Minor RaidDevice State 0 0 0 0 removed 1 0 0 1 removed 2 8 34 2 active sync /dev/sdc2 3 8 18 - spare /dev/sdb2 4 8 2 - spare /dev/sda2 How do I get rid of these devices and add the new partitions as active RAID devices? Update I seem to have gotten rid of them. My RAID is resyncing, but the two drives are still marked as spares and are number 3 and 4, which looks wrong. I'll have to wait for the resync to finish. All I did was to fix the metadata error by editing my mdadm.conf and rebooting. I tried rebooting before, but this time it worked for whatever reason. Number Major Minor RaidDevice State 3 8 2 0 spare rebuilding /dev/sda2 4 8 18 1 spare rebuilding /dev/sdb2 2 8 34 2 active sync /dev/sdc2

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• Ubuntu 10.04 and fedora 14 grub conflict

  - by sawren

  I tried to triple boot Windows xp, Fedora 14 and Ubuntu 10.04. I first installed Windows xp, then fedora followed by Ubuntu. The problem is that i don't get option to boot Ubuntu while Xp boots fine. It seems Ubuntu was unable to replace Fedora's grub with its own at MBR. Looking at their grub conf file, Fedora and Ubuntu identifies same harddisk as two different devices and i do have another 80 GB harddisk which doesn't have any OS. Below is the details on my partitions and partial information from grub files of both OS. Device Boot Start End Blocks Id System /dev/sda1 * 63 40965749 20482843+ 7 HPFS/NTFS /dev/sda2 102414436 312576704 105081134+ f W95 Ext'd (LBA) /dev/sda3 40965750 102414374 30724312+ 83 Linux - /Home (for fedora) /dev/sda5 102414438 204812684 51199123+ 7 HPFS/NTFS /dev/sda6 204812748 253634219 24410736 83 Linux -- ubuntu /dev/sda7 253634283 302455754 24410736 83 Linux -- fedora /dev/sda8 302455818 312576704 5060443+ 82 Linux swap / Solaris grub.cfg from ubuntu ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd1,7)' search --no-floppy --fs-uuid --set cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 linux /boot/vmlinuz-2.6.32-21-generic root=UUID=cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 ro quiet splash initrd /boot/initrd.img-2.6.32-21-generic } menuentry 'Ubuntu, with Linux 2.6.32-21-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd1,7)' search --no-floppy --fs-uuid --set cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 echo 'Loading Linux 2.6.32-21-generic ...' linux /boot/vmlinuz-2.6.32-21-generic root=UUID=cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.32-21-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod ext2 set root='(hd1,7)' search --no-floppy --fs-uuid --set cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod ext2 set root='(hd1,7)' search --no-floppy --fs-uuid --set cd55e078-a2c1-4d8a-9e87-ae838b6f4a05 linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Microsoft Windows XP Professional (on /dev/sdb1)" { insmod ntfs set root='(hd1,1)' search --no-floppy --fs-uuid --set cad48cc6d48cb5eb drivemap -s (hd0) ${root} chainloader +1 } menuentry "Fedora (2.6.35.14-96.fc14.i686) (on /dev/sdb6)" { insmod ext2 set root='(hd1,6)' search --no-floppy --fs-uuid --set 6aee34cf-f77a-489a-9361-85d07194b84b linux /boot/vmlinuz-2.6.35.14-96.fc14.i686 ro root=UUID=6aee34cf-f77a-489a-9361-85d07194b84b rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /boot/initramfs-2.6.35.14-96.fc14.i686.img } menuentry "Fedora (2.6.35.6-45.fc14.i686) (on /dev/sdb6)" { insmod ext2 set root='(hd1,6)' search --no-floppy --fs-uuid --set 6aee34cf-f77a-489a-9361-85d07194b84b linux /boot/vmlinuz-2.6.35.6-45.fc14.i686 ro root=UUID=6aee34cf-f77a-489a-9361-85d07194b84b rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /boot/initramfs-2.6.35.6-45.fc14.i686.img } ### END /etc/grub.d/30_os-prober ### grub.conf from fedora default=0 timeout=5 splashimage=(hd0,5)/boot/grub/splash.xpm.gz hiddenmenu title Fedora (2.6.35.14-96.fc14.i686) root (hd0,5) kernel /boot/vmlinuz-2.6.35.14-96.fc14.i686 ro root=UUID=6aee34cf-f77a-489a-9361-85d07194b84b rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /boot/initramfs-2.6.35.14-96.fc14.i686.img title Fedora (2.6.35.6-45.fc14.i686) root (hd0,5) kernel /boot/vmlinuz-2.6.35.6-45.fc14.i686 ro root=UUID=6aee34cf-f77a-489a-9361-85d07194b84b rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /boot/initramfs-2.6.35.6-45.fc14.i686.img title Other rootnoverify (hd0,0) chainloader +1

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• Need help partitioning when reinstalling Ubuntu 14.04

  - by Chris M.

  I upgraded to 14.04 about a month ago on my HP Mini netbook (about 16 GB hard disk). A few days ago the system crashed (I don't know why but I was using internet at the time). When I restarted the computer, Ubuntu would not load. Instead, I got a message from the BIOS saying Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key I took this to mean that I needed to reinstall 14.04. When I try to reinstall Ubuntu from the USB stick, I choose "Erase disk and install Ubuntu" but then I get a message: Some of the partitions you created are too small. Please make the following partitions at least this large: / 3.3 GB If you do not go back to the partitioner and increase the size of these partitions, the installation may fail. At first I hit Continue to see if it would install anyway, and it gave the message: The attempt to mount a file system with type ext4 in SCSI1 (0,0,0), partition # 1 (sda) at / failed. You may resume partitioning from the partitioning menu. The second time I hit Go Back, and it took me to the following partitioning table: Device Type Mount Point Format Size Used System /dev/sda /dev/sda1 ext4 (checked) 3228 MB Unknown /dev/sda5 swap (not checked) 1063 MB Unknown + - Change New Partition Table... Revert Device for boot loader installation: /dev/sda ATA JM Loader 001 (4.3 GB) At this point I'm not sure what to do. I've never partitioned my hard drive before and I don't want to screw things up. (I'm not particularly tech savvy.) Can you instruct me what I should do. (P.S. I'm afraid the table might not appear as I typed it in.) Results from fdisk: ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 4294 MB, 4294967296 bytes 255 heads, 63 sectors/track, 522 cylinders, total 8388608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sda doesn't contain a valid partition table Disk /dev/sdb: 7860 MB, 7860125696 bytes 155 heads, 31 sectors/track, 3194 cylinders, total 15351808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0009a565 Device Boot Start End Blocks Id System /dev/sdb1 * 2768 15351807 7674520 b W95 FAT32 ubuntu@ubuntu:~$ Here is what it displays when I open the Disks utility (I tried the screenshot terminal command you suggested but it didn't seem to do anything): 4.3 GB Hard Disk /dev/sda Model: JM Loader 001 (01000001) Size: 4.3 GB (4,294,967,296 bytes) Serial Number: 01234123412341234 Assessment: SMART is not supported Volumes Size: 4.3 GB (4,294,967,296 bytes) Device: /dev/sda Contents: Unknown (There is a button in the utility that when you click it gives the following options: Format... Create Disk Image... Restore Disk Image... Benchmark but SMART Data & Self-Tests... is dimmed out) When I hit F9 Change Boot Device Order, it shows the hard drive as: SATA:PM-JM Loader 001 When I hit F10 to get me into the BIOS Setup Utility, under Diagnostic it shows: Primary Hard Disk Self Test Not Support NetworkManager Tool State: disconnected Device: eth0 Type: Wired Driver: atl1c State: unavailable Default: no HW Address: 00:26:55:B0:7F:0C Capabilities: Carrier Detect: yes Wired Properties Carrier: off When I run command lshw -C network, I get: WARNING: you should run this program as super-user. *-network description: Network controller product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:01:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: bus_master cap_list configuration: driver=b43-pci-bridge latency=0 resources: irq:16 memory:feafc000-feafffff *-network description: Ethernet interface product: AR8132 Fast Ethernet vendor: Qualcomm Atheros physical id: 0 bus info: pci@0000:02:00.0 logical name: eth0 version: c0 serial: 00:26:55:b0:7f:0c capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.1-NAPI latency=0 link=no multicast=yes port=twisted pair resources: irq:43 memory:febc0000-febfffff ioport:ec80(size=128) WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

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• Why would Java app make RPC call to itself?

  - by amphibient

  I am working with a multithreaded homegrown multi-module app in my new job. We use the the Thrift protocol to communicate RPC calls between different stand-alone applications in a distributed system. One of them listens on multiple ports and I just noticed that it actually makes an RPC call to itself from one thread invoked from one socket it listens to (web service call) to another port within the same app. I verified that it could accomplish the same thing if it just went and directly called the method that the remote procedure ultimately invokes as it is all within the same application, same JVM. To make it even more mysterious, the call is completely synchronous, i.e. no callbacks involved. The first thread totally sits and waits until it makes a call across the wire to itself and comes back. Now, I am perplexed why anybody would do it this way. It seems like calling somebody on the phone that sits in the same room as you do. Can anybody provide an explanation why the developer before me would come up with the above mentioned model? Maybe there is a reason and I am missing something.

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• 'Buy the app' landing page implementations: redirect or javascript popup?

  - by benwad

  My site (using Django) has an app that I'm trying to push - I currently have a piece of middleware that redirects the user to a page advertising the app if they're accessing the page on the iPhone, then setting a cookie so that the user isn't bugged by the message every time they visit the site. This works fine, however checking the page with the mobile Googlebot checker shows that the Googlebot gets stuck in the redirect (since it doesn't store cookies) and therefore won't index the proper content. So, I'm trying to think of an alternative implementation that won't hurt the site's Google ranking and won't have any other adverse effects. I've considered a couple of options: Redirect (the current solution), but don't redirect if the user agent matches the Googlebot's UA string. This would be ideal, however I'm not sure if Google like their bot being treated differently from other users, and I'm afraid the site's ranking may be somehow penalised if I go ahead with this. Use a Javascript popup instead of a redirect. This would make sure the Googlebot finds the content it needs, however I envision this approach causing compatibility issues with the myriad mobile devices/browsers out there, and may affect the page load time. How valid are these options? And is there a better option for implementing this feature out there? I've tried researching this topic but surprisingly can't find any reputable-looking blog posts that explore this topic.

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• Is ZeroMQ a good choice to make a Python app and a C# managed assembly work together?

  - by Alex Bausk

  I have a task that involves talking to a .NET-based API (namely AutoCAD) to retrieve data, send commands, and react to events. I want to separate the API operations and the proper program logic (largely already implemented in Python) by using natural tools for both: a C# DLL for the former and a Python app for the latter. To connect these two pieces, I began exchanging JSON in ZeroMQ messages. I'm at early development stages but having recently discovered that ZeroMQ does not guarantee message delivery/order, I have reservations about whether this is a feasible way to go. Right now my app is a very basic REQ/REP pair and I plan to handle reacting to events and executing different commands by adding some sort of 'recipient-function' field to my message format. The reason that I want to use ZMQ is that I might be able to scale the software into a larger, multi-user, distributed solution sometime. I am a lay programmer so I would ask for your advice about this architecture. Should I just go ahead with it and plan to deal with message reliability/ordering when problems appear? Should I consider developing some kind of a REST wrapper around ZMQ?

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• Is my project a web site or a mobile app?

  - by Evik James

  I am a web developer. I have been developing web sites professionally for 15+ years using ColdFusion, SQL Server, and jQuery. I am doing a project for a client that uses the above technologies. The site has a mobile facet too. For that, I am using jQuery Mobile. The site enables retail store personnel to gather a store customer's preferences using any smart phone or tablet. The store personnel just needs to access a special link via a QR code and a login. Anyone can easily access the site from a PC's browser, too. Some sources suggest that mobile apps must be downloaded and installed using a third party, such as from Google, Amazon, or Apple. Others sources suggest that any information designed for use on mobile device is a mobile app. Regarding the site that is specifically designed for use by mobile devices that extensively uses jQuery Mobile, is this a "web site" or a "mobile app"? What is the "proper" description for this type of site? My customer insists that it is one and not the other. I insist that it is the other and not the one. Can you help me clarify this?

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• If I send an IPA over TestFlight, can it be used to deploy to the app store?

  - by Reid Belton

  I am currently working for a small startup. I was previously under contract, now I am working for equity (no pay). The thing is, there is not yet a signed agreement in place as the details are being worked out. I may finish development before the contract is ready. I'm not currently under any contract or agreement, so the other party doesn't have any legal claim (that I know of) to the code I'm writing now, other than NDA (which just precludes me from cutting him out and releasing on my own). He already has the old code that I wrote under contract. I've made it clear to the other party that I won't submit the app or turn over the code until there's something signed to protect my interests. I've stopped pushing commits to the company repo (I'm now the only developer actively working on the project). However, I would still like to send builds over TestFlight for feedback and testing purposes. The other party has access to the developer portal and iTunes Connect for code signing, etc. Things are amicable and I don't foresee getting burnt on this, but I'm not going to put myself in that position. My concern is that if I send a finished build via TestFlight, it could be extracted and submitted to the app store without my participation. They wouldn't have the source for future maintenance and updates, of course, but it could be reverse-engineered by another developer later working from the old code base. Is this technically feasible at all? If so, is there a way I can send builds for testing while protecting my interests?

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• How to setup users for desktop app with SQL Azure as backend?

  - by Manuel

  I'm considering SQL Azure as DB for a new application I'm developing. The reason I want to go with Azure is because I don't want to have to maintain yet another database(s) and I want my users to be able to access the data from anywhere. The problem is that I'm not clear regarding how to users will connect. The application is a basic CRUD type of windows app. I've read that you need to add your IP to SQL Azure's firewall to connect to it, but I don't know if it's only for administration purposes only. Can anyone clarify if anyone (anywhere) can access the data with the proper credentials? Which of the following scenarios would work best (if at all)? A) Add each user to SQL Azure and have the app connect directly to Azure as if it was connecting to SQL Server B) Add an anonymous user SQL Azure and pass the real user's password/hash with every call so the Azure database can service the requests accordingly. C) Put a WCF service in between so that it handles the authentication stuff. The service will only serve the appropriate information to the user given his/her authentication and SQL Azure would be open to the service exclusively. D) - ideas are welcomed - This is confusing because all Azure examples I see are for websites. I have a hard time believing SQL Azure wouldn't handle the case of desktop apps connecting to it. So what's the best practice?

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• Is there an open source version check library and web app?

  - by user52485

  I'm a developer for a cross platform (Win, MacOS, Linux) open source C++ application. I would like to have the program occasionally check for the latest version from our web site. Between the security, privacy, and cross platform network issues, I'd rather not roll our own solution. It seems like this is a common enough thing that there 'ought' to be a library/app which will do this. Unfortunately, the searches I've tried come up empty. Ideally, the web app would track requests and process the logs into some nice reports (number of users, what version, what platform, frequency of use, maybe even geographical info from IP address, etc.). While appropriately respecting privacy, etc. What pre-existing tools can help solve this problem? Edits: I am looking for a reporting tool, not a dependency checker. Our project has the challenge of keeping up with our users. Most do not join the mailing list. Our project has not been picked up by major distributions -- most of our users are Windows/MacOS anyway. When a new version comes out, we have no way of informing our users of its existence. Development is moving pretty fast, major features added every few months. We would like to provide the user with a way to check for an updated version. While we're at it, we would like to use these requests for some simple & anonymous usage tracking (X users running version Y with Z frequency, etc.). We do not need/want something that auto-updates or tracks dependencies on the system. We are not currently worried about update size -- when the user chooses to update, we expect them to download the complete latest version. We would like to keep this as simple as possible.

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• Should my web app have its own domain name?

  - by Daniero

  I'm going to get a domain name for my personal web page. It will contain my blog, photos and other personal stuff, plus different web apps and tools that I'm working on. I have put quite a lot of work in one of the web apps, and I think it has great potential. It covers a niche in a way that no other page has done before and I can see great possibilities to expand it. Via links to webstores and ads I think it could even make some money, and if I play it right this could be the place to go when you're into the specific niche that it covers (sorry for being so vague). My question is, would it be better for a (potentially great) web app like this to have its own domain name (nameofmyapp.com) instead of being a subpage of my personal page (mypersonaldomain.com/nameofmyapp)? Is the web app more likely to be found by others, via Google etc, with its own domain name? Could a "subpage" give more attention (visitors) to my personal page? pros and cons?

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• Failure connecting to Dell MD3200i from XenServer 6.2 pool

  - by Tom Sparrow

  This question also asked at Citrix Forums http://forums.citrix.com/thread.jspa?threadID=332289 I have a MD3200i that is currently working fine with my Xen5.6 pool, but I cannot get a connection to the new 6.2 pool to work. I previously had a problem with a 6.0 upgrade (which is why the old pool is still on 5.6), but rolled back rather than fix it as it wasn't urgent at the time. This install is on new machines - I tried 6.1 first (which had the same problems) then 6.2 was released the second day after installation so I switched to that. I've not installed anything from the Dell resource DVD at this point - I can't find anything saying I should, and everything I have read suggests it shouldn't be necessary. I can ping all 8 ip addresses from both servers in the pool, iscsiadm -m discovery works fine, I can login to the nodes and iscsiadm reports the sessions active correctly. I've added the required sections to multipath.conf, but multipath -ll reports DM multipath kernel driver not loaded immediately after boot. The following is a log of a test session immediately after boot. root@xen3 ~]# iscsiadm -m node --loginall=all Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.101,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.101,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.104,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.102,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.103,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.104,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.102,3260] Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.103,3260] Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.101,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.101,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.104,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.102,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.103,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.104,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.130.102,3260]: successful Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91, portal: 192.168.131.103,3260]: successful [root@xen3 ~]# iscsiadm -m session tcp: [1] 192.168.130.101:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [2] 192.168.131.101:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [3] 192.168.131.104:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [4] 192.168.131.102:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [5] 192.168.130.103:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [6] 192.168.130.104:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [7] 192.168.130.102:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [8] 192.168.131.103:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 [root@xen3 ~]# service multipathd restart ok Stopping multipathd daemon: [ OK ] Starting multipathd daemon: [ OK ] [root@xen3 ~]# multipath Jul 04 09:58:47 | DM multipath kernel driver not loaded Jul 04 09:58:47 | DM multipath kernel driver not loaded [root@xen3 ~]# multipath -ll Jul 04 09:59:03 | DM multipath kernel driver not loaded Jul 04 09:59:03 | DM multipath kernel driver not loaded [ root@xen3 ~]# modprobe dm_multipath [root@xen3 ~]# multipath Jul 04 10:19:50 | 36b8ca3a0e7024800194a0bd11891cd14: ignoring map create: 1Dell_Internal_Dual_SD_0123456789AB undef Dell,Internal Dual SD size=1.9G features='0' hwhandler='0' wp=undef `-+- policy='round-robin 0' prio=1 status=undef `- 7:0:0:0 sdb 8:16 undef ready running [root@xen3 ~]# multipath -ll 1Dell_Internal_Dual_SD_0123456789AB dm-1 Dell,Internal Dual SD size=1.9G features='0' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=1 status=enabled `- 7:0:0:0 sdb 8:16 active ready running [root@xen3 ~]# iscsiadm -m session tcp: [1] 192.168.130.101:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [2] 192.168.131.101:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [3] 192.168.131.104:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [4] 192.168.131.102:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [5] 192.168.130.103:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [6] 192.168.130.104:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [7] 192.168.130.102:3260,2 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 tcp: [8] 192.168.131.103:3260,1 iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 [root@xen3 ~]# dmesg | tail -n 50 [ 1161.881010] sd 8:0:0:0: [sdf] Unhandled error code [ 1161.881013] sd 8:0:0:0: [sdf] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1161.881017] sd 8:0:0:0: [sdf] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1161.881024] end_request: I/O error, dev sdf, sector 0 [ 1161.881031] Buffer I/O error on device sdf, logical block 0 [ 1161.881045] sd 15:0:0:0: [sdi] Unhandled error code [ 1161.881048] sd 15:0:0:0: [sdi] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1161.881052] sd 15:0:0:0: [sdi] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1161.881058] end_request: I/O error, dev sdi, sector 0 [ 1161.881065] Buffer I/O error on device sdi, logical block 0 [ 1161.881122] sd 9:0:0:0: [sdg] Unhandled error code [ 1161.881124] sd 9:0:0:0: [sdg] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1161.881126] sd 9:0:0:0: [sdg] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1161.881132] end_request: I/O error, dev sdg, sector 0 [ 1161.881140] Buffer I/O error on device sdg, logical block 0 [ 1168.220951] connection6:0: ping timeout of 15 secs expired, recv timeout 10, last rx 84060, last ping 85060, now 86560 [ 1168.220957] connection7:0: ping timeout of 15 secs expired, recv timeout 10, last rx 84060, last ping 85060, now 86560 [ 1168.220967] connection7:0: detected conn error (1011) [ 1168.220969] connection4:0: ping timeout of 15 secs expired, recv timeout 10, last rx 84060, last ping 85060, now 86560 [ 1168.220973] connection4:0: detected conn error (1011) [ 1168.220975] connection3:0: ping timeout of 15 secs expired, recv timeout 10, last rx 84060, last ping 85060, now 86560 [ 1168.220978] connection3:0: detected conn error (1011) [ 1168.220985] connection6:0: detected conn error (1011) [ 1168.480994] sd 14:0:0:0: [sde] Unhandled error code [ 1168.480998] sd 14:0:0:0: [sde] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1168.481001] sd 14:0:0:0: [sde] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1168.481009] end_request: I/O error, dev sde, sector 0 [ 1168.481015] Buffer I/O error on device sde, logical block 0 [ 1168.481076] sd 11:0:0:0: [sdc] Unhandled error code [ 1168.481078] sd 11:0:0:0: [sdc] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1168.481080] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1168.481087] end_request: I/O error, dev sdc, sector 0 [ 1168.481092] Buffer I/O error on device sdc, logical block 0 [ 1168.481144] sd 10:0:0:0: [sdd] Unhandled error code [ 1168.481147] sd 10:0:0:0: [sdd] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1168.481150] sd 10:0:0:0: [sdd] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1168.481156] end_request: I/O error, dev sdd, sector 0 [ 1168.481163] Buffer I/O error on device sdd, logical block 0 [ 1168.481168] sd 13:0:0:0: [sdj] Unhandled error code [ 1168.481170] sd 13:0:0:0: [sdj] Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK [ 1168.481172] sd 13:0:0:0: [sdj] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 [ 1168.481178] end_request: I/O error, dev sdj, sector 0 [ 1168.481184] Buffer I/O error on device sdj, logical block 0 [ 1457.105996] device-mapper: multipath round-robin: version 1.0.0 loaded [ 1457.106155] device-mapper: multipath: Cannot access device path 8:0: -16 [ 1457.106164] device-mapper: table: 252:1: multipath: error getting device [ 1457.106172] device-mapper: ioctl: error adding target to table [ 1457.171292] device-mapper: multipath: Cannot access device path 8:0: -16 [ 1457.171299] device-mapper: table: 252:1: multipath: error getting device [ 1457.171304] device-mapper: ioctl: error adding target to table [root@xen3 ~]# fdisk -l Disk /dev/sda: 299.4 GB, 299439751168 bytes 255 heads, 63 sectors/track, 36404 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 5 40131 de Dell Utility /dev/sda2 * 6 528 4194304 83 Linux Partition 2 does not end on cylinder boundary. /dev/sda3 528 1050 4194304 83 Linux /dev/sda4 1050 36404 283986359+ 8e Linux LVM Disk /dev/sdb: 2040 MB, 2040528896 bytes 255 heads, 63 sectors/track, 248 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 248 1992028+ 83 Linux Disk /dev/dm-1: 2040 MB, 2040528896 bytes 255 heads, 63 sectors/track, 248 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/dm-1p1 1 248 1992028+ 83 Linux [root@xen3 ~]# xe sr-probe type=lvmoiscsi device-config:target=192.168.130.101 device-config:targetIQN=iqn.1984-05.com.dell:powervault.md3200i.6782bcb0006bd850000000004ed88b91 Error code: SR_BACKEND_FAILURE_107 Error parameters: , The SCSIid parameter is missing or incorrect, <?xml version="1.0" ?> <iscsi-target/> Note: the xml ends there correctly on the last line - it doesn't ever return a list of LUNs (and there is one in the group on the SAN for those servers.

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• Ubuntu server has slow performance

  - by Rich

  I have a custom built Ubuntu 11.04 server with a 6 disk software RAID 10 primary drive. On it I'm primarily running a PostgreSQL and a few other utilities that stream data from the web. I often find after a few hours of uptime the server starts to lag with all kinds of processes. For example, it may take 10-15 seconds after log-in to get a shell prompt. It might take 5-10 seconds for top to come up. An ls might take a second or two. When I look at top there is almost no CPU usage. There's a fair amount of memory used by the PostgreSQL server but not enough to bleed into swap. I have no idea where to go from here, other than to suspect the RAID10 (I've only ever had software RAID 1's before). Edit: Output from top: top - 11:56:03 up 1:46, 3 users, load average: 0.89, 0.73, 0.72 Tasks: 119 total, 1 running, 118 sleeping, 0 stopped, 0 zombie Cpu(s): 0.2%us, 0.0%sy, 0.0%ni, 93.5%id, 6.2%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 16325596k total, 3478248k used, 12847348k free, 20880k buffers Swap: 19534176k total, 0k used, 19534176k free, 3041992k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1747 woodsp 20 0 109m 10m 4888 S 1 0.1 0:42.70 python 357 root 20 0 0 0 0 S 0 0.0 0:00.40 jbd2/sda3-8 1 root 20 0 24324 2284 1344 S 0 0.0 0:00.84 init 2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0 0.0 0:00.24 ksoftirqd/0 6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0 7 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/0 8 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/1 10 root 20 0 0 0 0 S 0 0.0 0:00.02 ksoftirqd/1 12 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/1 13 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/2 14 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/2:0 15 root 20 0 0 0 0 S 0 0.0 0:00.00 ksoftirqd/2 16 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/2 17 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/3 18 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/3:0 19 root 20 0 0 0 0 S 0 0.0 0:00.02 ksoftirqd/3 20 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/3 21 root 0 -20 0 0 0 S 0 0.0 0:00.00 cpuset 22 root 0 -20 0 0 0 S 0 0.0 0:00.00 khelper 23 root 20 0 0 0 0 S 0 0.0 0:00.00 kdevtmpfs 24 root 0 -20 0 0 0 S 0 0.0 0:00.00 netns 26 root 20 0 0 0 0 S 0 0.0 0:00.00 sync_supers df -h rpsharp@ncp-skookum:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 1.8T 549G 1.2T 32% / udev 7.8G 4.0K 7.8G 1% /dev tmpfs 3.2G 492K 3.2G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.8G 0 7.8G 0% /run/shm /dev/sda2 952M 128K 952M 1% /boot/efi /dev/md0 5.5T 562G 4.7T 11% /usr/local free -m psharp@ncp-skookum:~$ free -m total used free shared buffers cached Mem: 15942 3409 12533 0 20 2983 -/+ buffers/cache: 405 15537 Swap: 19076 0 19076 tail -50 /var/log/syslog Jul 3 06:31:32 ncp-skookum rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="1070" x-info="http://www.rsyslog.com"] rsyslogd was HUPed Jul 3 06:39:01 ncp-skookum CRON[14211]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) Jul 3 06:40:01 ncp-skookum CRON[14223]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 07:00:01 ncp-skookum CRON[14328]: (woodsp) CMD (/home/woodsp/bin/mail_tweetupdate # email an update) Jul 3 07:00:01 ncp-skookum CRON[14327]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 07:00:28 ncp-skookum sendmail[14356]: q63E0SoZ014356: from=woodsp, size=2328, class=0, nrcpts=2, msgid=<[email protected]>, relay=woodsp@localhost Jul 3 07:00:29 ncp-skookum sm-mta[14357]: q63E0Si6014357: from=<[email protected]>, size=2569, class=0, nrcpts=2, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Jul 3 07:00:29 ncp-skookum sendmail[14356]: q63E0SoZ014356: to=Spencer Wood <[email protected]>,Martin Lacayo <[email protected]>, ctladdr=woodsp (1004/1005), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=62328, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (q63E0Si6014357 Message accepted for delivery) Jul 3 07:00:29 ncp-skookum sm-mta[14359]: STARTTLS=client, relay=mx3.stanford.edu., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256 Jul 3 07:00:29 ncp-skookum sm-mta[14359]: q63E0Si6014357: to=<[email protected]>,<[email protected]>, ctladdr=<[email protected]> (1004/1005), delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=152569, relay=mx3.stanford.edu. [171.67.219.73], dsn=2.0.0, stat=Sent (Ok: queued as 8F3505802AC) Jul 3 07:09:08 ncp-skookum CRON[14396]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) Jul 3 07:17:01 ncp-skookum CRON[14438]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Jul 3 07:20:01 ncp-skookum CRON[14453]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 07:39:01 ncp-skookum CRON[14551]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) Jul 3 07:40:01 ncp-skookum CRON[14562]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 08:00:01 ncp-skookum CRON[14668]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 08:09:01 ncp-skookum CRON[14724]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) Jul 3 08:17:01 ncp-skookum CRON[14766]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Jul 3 08:20:01 ncp-skookum CRON[14781]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jul 3 08:39:01 ncp-skookum CRON[14881]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete) Jul 3 08:40:01 ncp-skookum CRON[14892]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Output of hdparm -t /dev/sd{a,b,c,d,e,f} This looks suspicious? /dev/sda: Timing buffered disk reads: 2 MB in 4.84 seconds = 423.39 kB/sec /dev/sdb: Timing buffered disk reads: 420 MB in 3.01 seconds = 139.74 MB/sec /dev/sdc: Timing buffered disk reads: 390 MB in 3.00 seconds = 129.87 MB/sec /dev/sdd: Timing buffered disk reads: 416 MB in 3.00 seconds = 138.51 MB/sec /dev/sde: Timing buffered disk reads: 422 MB in 3.00 seconds = 140.50 MB/sec /dev/sdf: Timing buffered disk reads: 416 MB in 3.01 seconds = 138.26 MB/sec

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• How can I create an Online compiler/Interpreter editor or is there any third party app that can be integrated? [on hold]

  - by atjoshi

  I am looking out for some solution where I can start developing an Online compiler/Interpreter editor. For Eg: http://code.hackerearth.com/5c4db5N Are there any third Party Pulgin Available or any way to do from scratch I am a PHP Dev. ? Looking for some possible hints how I can start with. Any link to good blog or tutorial. May be its not right place to ask this question but at least I can get best solutions here from experienced professionals. Thanks in advance

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• How to save data from multiple views of an iPhone app?

  - by DownUnder

  Hi Everyone. I'm making an app where I need to save the text in multiple views in the app when the app quits. I also need to be able to remove all of the data from just one of those views and when the app quits, it's possible not all of those views will have been created yet. After reading this post I thought perhaps it would be good to use a singleton that manages my app data which loads in the data when it is first requested and saved it when the app quits. Then in each view where I need to save data I can just set it on the singleton. I gave it a go but have run into some issues. At first I didn't synthesize the properties (as in the post I was using as a guide) but the compiler told me I needed to make getters and setters, so I did. Now when my applicationWIllTerminate: gets call the app crashes and the console says "Program received signal: “EXC_BAD_ACCESS”. kill quit". Is anyone able to tell me what I'm doing wrong, or suggest a better approach to saving the data? //SavedData.h #import <Foundation/Foundation.h> #define kFileName @"appData.plist" @interface SavedData : NSObject { NSString *information; NSString *name; NSString *email; NSString *phone; NSString *mobile; } @property(assign) NSString *information; @property(assign) NSString *name; @property(assign) NSString *email; @property(assign) NSString *phone; @property(assign) NSString *mobile; + (SavedData *)singleton; + (NSString *)dataFilePath; + (void)applicationWillTerminate:(NSNotification *)notification; @end //SavedData.m #import "SavedData.h" @implementation SavedData @synthesize information; @synthesize name; @synthesize email; @synthesize phone; @synthesize mobile; static SavedData * SavedData_Singleton = nil; + (SavedData *)singleton{ if (nil == SavedData_Singleton){ SavedData_Singleton = [[SavedData_Singleton alloc] init]; NSString *filePath = [self dataFilePath]; if([[NSFileManager defaultManager] fileExistsAtPath:filePath]){ NSMutableArray * array = [[NSMutableArray alloc] initWithContentsOfFile:filePath]; information = [array objectAtIndex:0]; name = [array objectAtIndex:1]; email = [array objectAtIndex:2]; phone = [array objectAtIndex:3]; mobile = [array objectAtIndex:4]; [array release]; } UIApplication *app = [UIApplication sharedApplication]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:app]; } return SavedData_Singleton; } + (NSString *)dataFilePath{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *DocumentsDirectory = [paths objectAtIndex:0]; return [DocumentsDirectory stringByAppendingPathComponent:kFileName]; } + (void)applicationWillTerminate:(NSNotification *)notification{ NSLog(@"Application will terminate received"); NSMutableArray *array = [[NSMutableArray alloc] init]; [array addObject:information]; [array addObject:name]; [array addObject:email]; [array addObject:phone]; [array addObject:mobile]; [array writeToFile:[self dataFilePath] atomically:YES]; [array release]; } @end Then when I want to use it I do myLabel.text = [SavedData singleton].information; And when I change the field [SavedData singleton].information = @"my string"; Any help will be very much appreciated!

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• GRE keepalive with Linux and RouterOS

  - by eri

  I have a Linux host and couple of routerboadrs. I created a GRE tunnel, but Linux does not answer keepalive packages. Then router mark gre connection as unreachable, so I cant send to Linux host from router subnet. If linux sends something into tunnel (ping, etc.) - RouterOS mark connection as reacheble. Second and next packages routed nicely until one minute idle (no traffic). Tunnel in linux a make in this way: remote=x.x.x.x dev=gre21 network=10.21.0.0/16 ip tunnel add ${dev} mode gre remote ${remote} ttl 255 ip addr add 172.16.1.1/24 peer 172.16.1.21 dev ${dev} ip link set ${dev} up ip route add ${network} dev ${dev} And ip l: 14: gre21: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN link/gre 0.0.0.0 peer 109.60.170.15 How to set state "running"? How to keep alive tunnel? Ping in cron?

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• Problem after resizing partition for Fedora under Vmware fusion

  - by user20196

  Hi, I am running FC9 under VMware Fusion 3.0 I wanted to resize my /dev/sda2 partition. In order to do that I did the following: 0. changed the size of the vmware file (under VMware settings). 1. rebooted the host to rescue mode without mounted disks 2. fdisk - removed & added /dev/sda2 - i had bigger /dev/sda2 3. lvm pvresize /dev/sda2 4. lvm pvdisplay - it showed me bigger size on /dev/VolGroup00 for /dev/sda2 5. lvm vgchange -a y - device-mapper: reload ioctl failed: Invalid argument - 2 logical volume(s) in volume group "VolGroup00" now active This is not true because there is no /dev/VolGroup00/LogVol00 My whole "/" disappeared. dmsetup table, shows: VolGroup00-LogVol01: 0 2097152 linear 8:2 38338944 VolGroup00-LogVol00: Can some one help me to solve this? Thank You.

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