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• WOL doesn't work if set to anything other than `a` but this setting makes it boot all the time

  - by Elton Carvalho

  I manage a small "cluster" of 4 Xeon machines with Intel boards in my lab. They are all plugged to a 5-port 3-Com switch with static IP addresses like 10.0.0.x. They are all running OpenSuse 11.4 and their /home/ is served by one of the machines (node00) via NFS. They are plugged to an UPS that can keep them on for ca. 15 minutes, but there are lots of electric shortages due to "unscheduled maintenace" that are longer than this. So they end up being powered down without notice. If I set the BIOS to turn them on after power shortages, the issue is that they all boot at the same time and, if node00 decides to run fsck in the /home/ partition, it does not finish booting before the others try to NFS mount their /home/. I am trying to make wake on lan work, so I can choose to boot the NFS clients only after the server has successfully booted. The problem is that when I run ethtool I get an output like this: Supports Wake-on: pumbag Wake-on: g Theoretically, it is set to wake on MagicPacket(tm), according to the manual. But sending the WOL packet using wol -i 10.0.0.255 $MACADDR does not wake up the box after I shut it down with halt. The ethernet link led blinks after I send the packet, so it appears to be getting to the machine. However, if I set it up with ethtool -s eth1 wol bag, the machine always wakes up right after halting, even if I don't send the Magic packet. This means that the device can wake up with LAN activity, but seems to be ignoring the magic packet. Setting wol ag does not wake the box with the MagicPacket. Does setting wol a mean that it should boot with any broadcast message? How can I diagnose the issue of the machine not waking up with the MagicPacket even though I am sending it and it's set up to wake up with it? Thanks in advance!

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• Linux NFS create mask and force user equivalent

  - by Mike

  I have two Linux servers: fileserver Debian 5.0.3 (2.6.26-2-686) Samba version 3.4.2 apache Ubuntu 10.04 LTS (2.6.32-23-generic) Apache 2.2.14 I have a number of Samba shares on fileserver so that I can access files from Windows PCs. I am also exporting /data/www-data to the apache server, where I have it mounted as /var/www. The setup is okay, except for when I come to create files on the NFS mount. I end up with files that cannot be read by Apache, or which cannot be modified by other users on my system. With Samba, I can specify force user, force group, create mask and directory mask, and this ensures that all files are created with suitable permissions for my Apache web server. I can't find a way to do this with NFS. Is there a way to force permissions and ownership with NFS - am I missing something obvious? Although I've spent quite a bit of time with Linux, and am weaning myself off Windows, I still haven't quite got to grip with Linux permissions... If this is not the right way to do things, I am open to alternative suggestions.

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• Advice: USB Monitoring Programming

  - by Kashif

  I need an advice about USB programming in linux. i have to design a USB monitoring program that 'll keep checking usb ports of a linux cent os. as soon as a usb or external hard disk is connected, this program will shoot an email to some specific person about detail of usb (as size, mount on, time). when usb is disconnected, it will again shoot an email to some person with same kind of information. mean while this program will also write logs in syslog/messages with name of programing for easy tracking. Now I want ask that what is best way to develop this program. as I'm new to this field so i know nothing about it? either i should use perl, bash scripting or some other language? I have no idea what is right way to adopt coz this program will keep running all the time to keep a check on usb ports. I know few commands in like lsusb, fdisk (to check attached usb) and df -h (to get detail of usb) but dont know how i can achieve using these commands that i am thinking. also one more thing that in future i also need to modify this program for ubuntu and Citrix XenServer and it should be same everywhere.

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• Poor write performance on Debian server running NFS with 22TB exported JFS filesystem

  - by user143546

  I am currently running a debian server that is exporting a large JFS filesystem (22TB) over NFS (nfs-kernel-server.) When attempting to write to the NFS share, the performance is very poor. The 22TB disk is sitting on a NAS mounted using iSCSI. It will bust for a moment near expected line speed, and then sit idle for several seconds. Very little traffic measured in the low kb/sec. The wait peeks on write. When reading from the NFS mount, the system operates at expected speeds (11MB/sec). The issue does not occur when using SFTP, rsync, or local coping (non-nfs). The issue persists between stable and testing releases. On the same machine I have a 14TB ext4 filesystem using the exact same export configuration that does not share the issue. This share is not in regular use and thus not consuming resources. NFS Server: cat /etc/exports /data2 10.1.20.86(rw,no_subtree_check,async,all_squash) cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /etc/default/nfs-kernel-server RPCNFSDCOUNT=8 RPCNFSDPRIORITY=0 RPCMOUNTDOPTS=--manage-gids NEED_SVCGSSD= RPCSVCGSSDOPTS= NFS Client: cat /etc/fstab 10.1.20.100:/data2 /root/incoming nfs rw,noatime,soft,intr,noacl 0 2 cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /proc/mounts 10.1.20.100:/data2/ /root/incoming nfs4 rw,noatime,vers=4,rsize=262144,wsize=262144,namlen=255,soft,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.1.20.86,minorversion=0,addr=10.1.20.100 0 0 This problem has me pretty stumped. Any help would be greatly welcomed. Thanks.

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• The best way to hide data Encryption,Connection,Hardware

  - by Tico Raaphorst

  So to say, if i have a VPS which i own now, and i wanted to make the most secure and stable system that i can make. How would i do that? Just to try: I installed debian 7 with LVM Encryption via installation: You get the 2 partitions a /boot and a encrypted partition. When booting you will be prompted to fill in the password to unlock the encryption of the encrypted partition, Which then will have more partitions like /home /usr and swapspace which will automatically mount. Now, i do need to fill in the password over a VNC-SSL connection via the control panel website of the VPS hoster, so they can see my disk encryption password if they wanted to, they have the option if they wanted to look at what i have as data right? Data encryption on VPS , Is it possible to have a 100% secure virtual private server? So lets say i have my server and it is sitting well locked next to me, with the following examples covered bios (you have to replace bios) raid (you have to unlock raid-config) disk (you have to unlock disk encryption) filelike-zip-tar (files are stored in encrypted archives) which are in some other crypted file mounted as partition (archives mounted as partitions) all on the same system So it will be slow but it would be extremely difficult to crack the encryption. So to say if you stole the server. Then i only need to make the connection like ssh safer with single use passwords, block all incoming and outgoing connections but give one "exception" for myself. And maybe one for if i somehow lose my identity for the "exeption" What other overkill but realistic security options are available, i have heard about SElinux?

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• Boot records messed on dual boot (win7 and ubuntu) machine with SSD and HDD

  - by Michael

  i have a lenovo ideapad y570 with two hard drives: SSD and normal HDD both managed by RapidDrive and windows 7 pre-installed. First, i have shrunk my 500 GB HDD a little bit to make some place for a linux installation. Then i installed linux mint 12 to it, also installed grub onto the drive (dev/sdb). Installation programm has not allowed me to install grub on sda. Then i replaced linux mint with ubuntu 12.04 but installed grub onto the SSD (which is dev/sda and was the default-option). After that i could boot into my windows, only ubuntu worked. So i did a research, and tried: rewriting mbr of windows into sda1, reinstalling grub, replacing grub2 with grub-legacy, and now i think my partitions table are totally messed. Here is fdisk -l output: ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders, total 125045424 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 Device Boot Start End Blocks Id System /dev/sda1 * 2048 411647 204800 7 HPFS/NTFS/exFAT /dev/sda2 411648 1009430959 504509656 7 HPFS/NTFS/exFAT Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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: 0x5e5d1cc8 Device Boot Start End Blocks Id System /dev/sdb1 * 1979 884389887 442193954+ 12 Compaq diagnostics /dev/sdb2 884391934 976771071 46189569 5 Extended /dev/sdb5 884391936 937705471 26656768 83 Linux /dev/sdb6 937707520 967006207 14649344 83 Linux /dev/sdb7 967008256 976771071 4881408 82 Linux swap / Solaris I also cant mount any windows partitions to recover data. And when i open gparted, the whole sda-disk appears unallocated and it states "can not have a partition outside the disk!", also the end-sector address of /dev/sda2 confuses me. If i boot from the SSD, it throws some mbr error and wont boot, if i boot from the HDD, i only get the grub bash. How do i restore the partition tables? I can boot only from a live-cd at the machine. Thanks for any help.

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• GVIM hangs when saving through GVFS' FTP

  - by Lie Ryan

  I loved Gnome's Nautilus and FTP integration and being able to mount a remote FTP directory as a regular bookmark/directory, and double clicking any remote files to open in any unmodified program. I also loved editing text files with GVim. However, if I double clicked file on Nautilus to open a text file in Gvim, then saving a file will take about 10 seconds and GVim will hang for that amount of time. The major irritant is that I cannot continue editing while the text editor is waiting for the write to finish, this delay interrupted my workflow and thought process and saving becomes a painful process. The other problem is that I don't think simply uploading a file should take that much time. I'm aware of GVim's internal FTP support, but they are not as well integrated with Nautilus's FTP. So a few question: Is there a way to make GVim or GVFS to save in background while I continue editing? Why is GVFS so slow? Is there any way to set GVFS to use a single persistent FTP connection instead of creating a new FTP connection each time? I'm on Gentoo Linux x86-64.

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• Why is windows not able to create a system partition?

  - by hughes

  I'm reinstalling Windows 7 64 bit, and I encountered an issue I've never seen before. I have a legit copy of Win 64 Professional, and I've installed it probably a half dozen times on this machine in the past without a problem. Googling the error only brings me to issues with people who are upgrading to win7. The drive itself seems to not have a problem. I can mount it on other systems and I can create an NTFS partition on it on other machines. I can install Ubuntu on it without any issues. Additionally, if I try using my alternate backup hard drive, the installer gives the same error. I have run diskpart from the setup page and clean seems to report that all is well. However, I cannot get past the screen below, which says Setup was unable to create a new system partition or locate an existing system partition. This happens regardless of whether or not the disk space is already allocated. What is causing this? How do I solve or get past this?

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• Cannot open root device xvda1 or unknown-block(0,0)

  - by svoop

  I'm putting together a Dom0 and three DomU (all Gentoo) with kernel 3.5.7 and Xen 4.1.1. Each Dom has it's own md (md0 for Dom0, md1 for Dom1 etc). Dom0 works fine so far, however, I'm stuck trying to create DomUs. It appears the xvda1 device on DomU is not created or accessible: Parsing config file dom1 domainbuilder: detail: xc_dom_allocate: cmdline="root=/dev/xvda1 console=hvc0 root=/dev/xvda1 ro 3", features="(null)" domainbuilder: detail: xc_dom_kernel_mem: called domainbuilder: detail: xc_dom_boot_xen_init: ver 4.1, caps xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 domainbuilder: detail: xc_dom_parse_image: called domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary loader ... domainbuilder: detail: loader probe failed domainbuilder: detail: xc_dom_find_loader: trying Linux bzImage loader ... domainbuilder: detail: xc_dom_malloc : 10530 kB domainbuilder: detail: xc_dom_do_gunzip: unzip ok, 0x2f7a4f -> 0xa48888 domainbuilder: detail: loader probe OK xc: detail: elf_parse_binary: phdr: paddr=0x1000000 memsz=0x558000 xc: detail: elf_parse_binary: phdr: paddr=0x1558000 memsz=0x690e8 xc: detail: elf_parse_binary: phdr: paddr=0x15c2000 memsz=0x127c0 xc: detail: elf_parse_binary: phdr: paddr=0x15d5000 memsz=0x533000 xc: detail: elf_parse_binary: memory: 0x1000000 -> 0x1b08000 xc: detail: elf_xen_parse_note: GUEST_OS = "linux" xc: detail: elf_xen_parse_note: GUEST_VERSION = "2.6" xc: detail: elf_xen_parse_note: XEN_VERSION = "xen-3.0" xc: detail: elf_xen_parse_note: VIRT_BASE = 0xffffffff80000000 xc: detail: elf_xen_parse_note: ENTRY = 0xffffffff815d5210 xc: detail: elf_xen_parse_note: HYPERCALL_PAGE = 0xffffffff81001000 xc: detail: elf_xen_parse_note: FEATURES = "!writable_page_tables|pae_pgdir_above_4gb" xc: detail: elf_xen_parse_note: PAE_MODE = "yes" xc: detail: elf_xen_parse_note: LOADER = "generic" xc: detail: elf_xen_parse_note: unknown xen elf note (0xd) xc: detail: elf_xen_parse_note: SUSPEND_CANCEL = 0x1 xc: detail: elf_xen_parse_note: HV_START_LOW = 0xffff800000000000 xc: detail: elf_xen_parse_note: PADDR_OFFSET = 0x0 xc: detail: elf_xen_addr_calc_check: addresses: xc: detail: virt_base = 0xffffffff80000000 xc: detail: elf_paddr_offset = 0x0 xc: detail: virt_offset = 0xffffffff80000000 xc: detail: virt_kstart = 0xffffffff81000000 xc: detail: virt_kend = 0xffffffff81b08000 xc: detail: virt_entry = 0xffffffff815d5210 xc: detail: p2m_base = 0xffffffffffffffff domainbuilder: detail: xc_dom_parse_elf_kernel: xen-3.0-x86_64: 0xffffffff81000000 -> 0xffffffff81b08000 domainbuilder: detail: xc_dom_mem_init: mem 5000 MB, pages 0x138800 pages, 4k each domainbuilder: detail: xc_dom_mem_init: 0x138800 pages domainbuilder: detail: xc_dom_boot_mem_init: called domainbuilder: detail: x86_compat: guest xen-3.0-x86_64, address size 64 domainbuilder: detail: xc_dom_malloc : 10000 kB domainbuilder: detail: xc_dom_build_image: called domainbuilder: detail: xc_dom_alloc_segment: kernel : 0xffffffff81000000 -> 0xffffffff81b08000 (pfn 0x1000 + 0xb08 pages) domainbuilder: detail: xc_dom_pfn_to_ptr: domU mapping: pfn 0x1000+0xb08 at 0x7fdec9b85000 xc: detail: elf_load_binary: phdr 0 at 0x0x7fdec9b85000 -> 0x0x7fdeca0dd000 xc: detail: elf_load_binary: phdr 1 at 0x0x7fdeca0dd000 -> 0x0x7fdeca1460e8 xc: detail: elf_load_binary: phdr 2 at 0x0x7fdeca147000 -> 0x0x7fdeca1597c0 xc: detail: elf_load_binary: phdr 3 at 0x0x7fdeca15a000 -> 0x0x7fdeca1cd000 domainbuilder: detail: xc_dom_alloc_segment: phys2mach : 0xffffffff81b08000 -> 0xffffffff824cc000 (pfn 0x1b08 + 0x9c4 pages) domainbuilder: detail: xc_dom_pfn_to_ptr: domU mapping: pfn 0x1b08+0x9c4 at 0x7fdec91c1000 domainbuilder: detail: xc_dom_alloc_page : start info : 0xffffffff824cc000 (pfn 0x24cc) domainbuilder: detail: xc_dom_alloc_page : xenstore : 0xffffffff824cd000 (pfn 0x24cd) domainbuilder: detail: xc_dom_alloc_page : console : 0xffffffff824ce000 (pfn 0x24ce) domainbuilder: detail: nr_page_tables: 0x0000ffffffffffff/48: 0xffff000000000000 -> 0xffffffffffffffff, 1 table(s) domainbuilder: detail: nr_page_tables: 0x0000007fffffffff/39: 0xffffff8000000000 -> 0xffffffffffffffff, 1 table(s) domainbuilder: detail: nr_page_tables: 0x000000003fffffff/30: 0xffffffff80000000 -> 0xffffffffbfffffff, 1 table(s) domainbuilder: detail: nr_page_tables: 0x00000000001fffff/21: 0xffffffff80000000 -> 0xffffffff827fffff, 20 table(s) domainbuilder: detail: xc_dom_alloc_segment: page tables : 0xffffffff824cf000 -> 0xffffffff824e6000 (pfn 0x24cf + 0x17 pages) domainbuilder: detail: xc_dom_pfn_to_ptr: domU mapping: pfn 0x24cf+0x17 at 0x7fdece676000 domainbuilder: detail: xc_dom_alloc_page : boot stack : 0xffffffff824e6000 (pfn 0x24e6) domainbuilder: detail: xc_dom_build_image : virt_alloc_end : 0xffffffff824e7000 domainbuilder: detail: xc_dom_build_image : virt_pgtab_end : 0xffffffff82800000 domainbuilder: detail: xc_dom_boot_image: called domainbuilder: detail: arch_setup_bootearly: doing nothing domainbuilder: detail: xc_dom_compat_check: supported guest type: xen-3.0-x86_64 <= matches domainbuilder: detail: xc_dom_compat_check: supported guest type: xen-3.0-x86_32p domainbuilder: detail: xc_dom_compat_check: supported guest type: hvm-3.0-x86_32 domainbuilder: detail: xc_dom_compat_check: supported guest type: hvm-3.0-x86_32p domainbuilder: detail: xc_dom_compat_check: supported guest type: hvm-3.0-x86_64 domainbuilder: detail: xc_dom_update_guest_p2m: dst 64bit, pages 0x138800 domainbuilder: detail: clear_page: pfn 0x24ce, mfn 0x37ddee domainbuilder: detail: clear_page: pfn 0x24cd, mfn 0x37ddef domainbuilder: detail: xc_dom_pfn_to_ptr: domU mapping: pfn 0x24cc+0x1 at 0x7fdece675000 domainbuilder: detail: start_info_x86_64: called domainbuilder: detail: setup_hypercall_page: vaddr=0xffffffff81001000 pfn=0x1001 domainbuilder: detail: domain builder memory footprint domainbuilder: detail: allocated domainbuilder: detail: malloc : 20658 kB domainbuilder: detail: anon mmap : 0 bytes domainbuilder: detail: mapped domainbuilder: detail: file mmap : 0 bytes domainbuilder: detail: domU mmap : 21392 kB domainbuilder: detail: arch_setup_bootlate: shared_info: pfn 0x0, mfn 0xbaa6f domainbuilder: detail: shared_info_x86_64: called domainbuilder: detail: vcpu_x86_64: called domainbuilder: detail: vcpu_x86_64: cr3: pfn 0x24cf mfn 0x37dded domainbuilder: detail: launch_vm: called, ctxt=0x7fff224e4ea0 domainbuilder: detail: xc_dom_release: called Daemon running with PID 4639 [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.5.7-gentoo (root@majordomo) (gcc version 4.5.4 (Gentoo 4.5.4 p1.0, pie-0.4.7) ) #1 SMP Tue Nov 20 10:49:51 CET 2012 [ 0.000000] Command line: root=/dev/xvda1 console=hvc0 root=/dev/xvda1 ro 3 [ 0.000000] ACPI in unprivileged domain disabled [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] Xen: [mem 0x0000000000000000-0x000000000009ffff] usable [ 0.000000] Xen: [mem 0x00000000000a0000-0x00000000000fffff] reserved [ 0.000000] Xen: [mem 0x0000000000100000-0x0000000138ffffff] usable [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] MPS support code is not built-in. [ 0.000000] Using acpi=off or acpi=noirq or pci=noacpi may have problem [ 0.000000] DMI not present or invalid. [ 0.000000] No AGP bridge found [ 0.000000] e820: last_pfn = 0x139000 max_arch_pfn = 0x400000000 [ 0.000000] e820: last_pfn = 0x100000 max_arch_pfn = 0x400000000 [ 0.000000] init_memory_mapping: [mem 0x00000000-0xffffffff] [ 0.000000] init_memory_mapping: [mem 0x100000000-0x138ffffff] [ 0.000000] NUMA turned off [ 0.000000] Faking a node at [mem 0x0000000000000000-0x0000000138ffffff] [ 0.000000] Initmem setup node 0 [mem 0x00000000-0x138ffffff] [ 0.000000] NODE_DATA [mem 0x1387fc000-0x1387fffff] [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x00010000-0x00ffffff] [ 0.000000] DMA32 [mem 0x01000000-0xffffffff] [ 0.000000] Normal [mem 0x100000000-0x138ffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00010000-0x0009ffff] [ 0.000000] node 0: [mem 0x00100000-0x138ffffff] [ 0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs [ 0.000000] No local APIC present [ 0.000000] APIC: disable apic facility [ 0.000000] APIC: switched to apic NOOP [ 0.000000] e820: cannot find a gap in the 32bit address range [ 0.000000] e820: PCI devices with unassigned 32bit BARs may break! [ 0.000000] e820: [mem 0x139100000-0x1394fffff] available for PCI devices [ 0.000000] Booting paravirtualized kernel on Xen [ 0.000000] Xen version: 4.1.1 (preserve-AD) [ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1 nr_node_ids:1 [ 0.000000] PERCPU: Embedded 26 pages/cpu @ffff880138400000 s75712 r8192 d22592 u2097152 [ 0.000000] Built 1 zonelists in Node order, mobility grouping on. Total pages: 1259871 [ 0.000000] Policy zone: Normal [ 0.000000] Kernel command line: root=/dev/xvda1 console=hvc0 root=/dev/xvda1 ro 3 [ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes) [ 0.000000] __ex_table already sorted, skipping sort [ 0.000000] Checking aperture... [ 0.000000] No AGP bridge found [ 0.000000] Memory: 4943980k/5128192k available (3937k kernel code, 448k absent, 183764k reserved, 1951k data, 524k init) [ 0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] Hierarchical RCU implementation. [ 0.000000] NR_IRQS:4352 nr_irqs:256 16 [ 0.000000] Console: colour dummy device 80x25 [ 0.000000] console [tty0] enabled [ 0.000000] console [hvc0] enabled [ 0.000000] installing Xen timer for CPU 0 [ 0.000000] Detected 3411.602 MHz processor. [ 0.000999] Calibrating delay loop (skipped), value calculated using timer frequency.. 6823.20 BogoMIPS (lpj=3411602) [ 0.000999] pid_max: default: 32768 minimum: 301 [ 0.000999] Security Framework initialized [ 0.001355] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) [ 0.002974] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) [ 0.003441] Mount-cache hash table entries: 256 [ 0.003595] Initializing cgroup subsys cpuacct [ 0.003599] Initializing cgroup subsys freezer [ 0.003637] ENERGY_PERF_BIAS: Set to 'normal', was 'performance' [ 0.003637] ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8) [ 0.003643] CPU: Physical Processor ID: 0 [ 0.003645] CPU: Processor Core ID: 0 [ 0.003702] SMP alternatives: switching to UP code [ 0.011791] Freeing SMP alternatives: 12k freed [ 0.011835] Performance Events: unsupported p6 CPU model 42 no PMU driver, software events only. [ 0.011886] Brought up 1 CPUs [ 0.011998] Grant tables using version 2 layout. [ 0.012009] Grant table initialized [ 0.012034] NET: Registered protocol family 16 [ 0.012328] PCI: setting up Xen PCI frontend stub [ 0.015089] bio: create slab <bio-0> at 0 [ 0.015158] ACPI: Interpreter disabled. [ 0.015180] xen/balloon: Initialising balloon driver. [ 0.015180] xen-balloon: Initialising balloon driver. [ 0.015180] vgaarb: loaded [ 0.016126] SCSI subsystem initialized [ 0.016314] PCI: System does not support PCI [ 0.016320] PCI: System does not support PCI [ 0.016435] NetLabel: Initializing [ 0.016438] NetLabel: domain hash size = 128 [ 0.016440] NetLabel: protocols = UNLABELED CIPSOv4 [ 0.016447] NetLabel: unlabeled traffic allowed by default [ 0.016475] Switching to clocksource xen [ 0.017434] pnp: PnP ACPI: disabled [ 0.017501] NET: Registered protocol family 2 [ 0.017864] IP route cache hash table entries: 262144 (order: 9, 2097152 bytes) [ 0.019322] TCP established hash table entries: 524288 (order: 11, 8388608 bytes) [ 0.020376] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) [ 0.020497] TCP: Hash tables configured (established 524288 bind 65536) [ 0.020500] TCP: reno registered [ 0.020525] UDP hash table entries: 4096 (order: 5, 131072 bytes) [ 0.020564] UDP-Lite hash table entries: 4096 (order: 5, 131072 bytes) [ 0.020624] NET: Registered protocol family 1 [ 0.020658] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) [ 0.020662] software IO TLB [mem 0xfb632000-0xff631fff] (64MB) mapped at [ffff8800fb632000-ffff8800ff631fff] [ 0.020750] platform rtc_cmos: registered platform RTC device (no PNP device found) [ 0.021378] HugeTLB registered 2 MB page size, pre-allocated 0 pages [ 0.023378] msgmni has been set to 9656 [ 0.023544] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [ 0.023549] io scheduler noop registered [ 0.023551] io scheduler deadline registered [ 0.023580] io scheduler cfq registered (default) [ 0.023650] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [ 0.023845] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 0.024082] Non-volatile memory driver v1.3 [ 0.024085] Linux agpgart interface v0.103 [ 0.024207] Event-channel device installed. [ 0.024265] [drm] Initialized drm 1.1.0 20060810 [ 0.024268] [drm:i915_init] *ERROR* drm/i915 can't work without intel_agp module! [ 0.025145] brd: module loaded [ 0.025565] loop: module loaded [ 0.045646] Initialising Xen virtual ethernet driver. [ 0.198264] i8042: PNP: No PS/2 controller found. Probing ports directly. [ 0.199096] i8042: No controller found [ 0.199139] mousedev: PS/2 mouse device common for all mice [ 0.259303] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0 [ 0.259353] rtc_cmos: probe of rtc_cmos failed with error -38 [ 0.259440] md: raid1 personality registered for level 1 [ 0.259542] nf_conntrack version 0.5.0 (16384 buckets, 65536 max) [ 0.259732] ip_tables: (C) 2000-2006 Netfilter Core Team [ 0.259747] TCP: cubic registered [ 0.259886] NET: Registered protocol family 10 [ 0.260031] ip6_tables: (C) 2000-2006 Netfilter Core Team [ 0.260070] sit: IPv6 over IPv4 tunneling driver [ 0.260194] NET: Registered protocol family 17 [ 0.260213] Bridge firewalling registered [ 5.360075] XENBUS: Waiting for devices to initialise: 25s...20s...15s...10s...5s...0s...235s...230s...225s...220s...215s...210s...205s...200s...195s...190s...185s...180s...175s...170s...165s...160s...155s...150s...145s...140s...135s...130s...125s...120s...115s...110s...105s...100s...95s...90s...85s...80s...75s...70s...65s...60s...55s...50s...45s...40s...35s...30s...25s...20s...15s...10s...5s...0s... [ 270.360180] XENBUS: Timeout connecting to device: device/vbd/51713 (local state 3, remote state 1) [ 270.360273] md: Waiting for all devices to be available before autodetect [ 270.360277] md: If you don't use raid, use raid=noautodetect [ 270.360388] md: Autodetecting RAID arrays. [ 270.360392] md: Scanned 0 and added 0 devices. [ 270.360394] md: autorun ... [ 270.360395] md: ... autorun DONE. [ 270.360431] VFS: Cannot open root device "xvda1" or unknown-block(0,0): error -6 [ 270.360435] Please append a correct "root=" boot option; here are the available partitions: [ 270.360440] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 270.360444] Pid: 1, comm: swapper/0 Not tainted 3.5.7-gentoo #1 [ 270.360446] Call Trace: [ 270.360454] [<ffffffff813d2205>] ? panic+0xbe/0x1c5 [ 270.360459] [<ffffffff813d2358>] ? printk+0x4c/0x51 [ 270.360464] [<ffffffff815d5fb7>] ? mount_block_root+0x24f/0x26d [ 270.360469] [<ffffffff815d62b6>] ? prepare_namespace+0x168/0x192 [ 270.360474] [<ffffffff815d5ca7>] ? kernel_init+0x1b0/0x1c2 [ 270.360477] [<ffffffff815d5500>] ? loglevel+0x34/0x34 [ 270.360482] [<ffffffff813d5a64>] ? kernel_thread_helper+0x4/0x10 [ 270.360486] [<ffffffff813d4038>] ? retint_restore_args+0x5/0x6 [ 270.360490] [<ffffffff813d5a60>] ? gs_change+0x13/0x13 The config: name = "dom1" bootloader = "/usr/bin/pygrub" root = "/dev/xvda1 ro" extra = "3" # runlevel memory = 5000 disk = [ 'phy:/dev/md1,xvda1,w' ] # vif = [ 'ip=..., vifname=veth1' ] # none for now Here are some details on the Dom0 kernel (grepping for "xen"): CONFIG_XEN=y CONFIG_XEN_DOM0=y CONFIG_XEN_PRIVILEGED_GUEST=y CONFIG_XEN_PVHVM=y CONFIG_XEN_MAX_DOMAIN_MEMORY=500 CONFIG_XEN_SAVE_RESTORE=y CONFIG_PCI_XEN=y CONFIG_XEN_PCIDEV_FRONTEND=y # CONFIG_XEN_BLKDEV_FRONTEND is not set CONFIG_XEN_BLKDEV_BACKEND=y # CONFIG_XEN_NETDEV_FRONTEND is not set CONFIG_XEN_NETDEV_BACKEND=y CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y CONFIG_HVC_XEN=y CONFIG_HVC_XEN_FRONTEND=y # CONFIG_XEN_WDT is not set # CONFIG_XEN_FBDEV_FRONTEND is not set # Xen driver support CONFIG_XEN_BALLOON=y # CONFIG_XEN_SELFBALLOONING is not set CONFIG_XEN_SCRUB_PAGES=y CONFIG_XEN_DEV_EVTCHN=y CONFIG_XEN_BACKEND=y CONFIG_XENFS=y CONFIG_XEN_COMPAT_XENFS=y CONFIG_XEN_SYS_HYPERVISOR=y CONFIG_XEN_XENBUS_FRONTEND=y CONFIG_XEN_GNTDEV=m CONFIG_XEN_GRANT_DEV_ALLOC=m CONFIG_SWIOTLB_XEN=y CONFIG_XEN_TMEM=y CONFIG_XEN_PCIDEV_BACKEND=m CONFIG_XEN_PRIVCMD=y CONFIG_XEN_ACPI_PROCESSOR=m And the DomU kernel (grepping for "xen"): CONFIG_XEN=y CONFIG_XEN_DOM0=y CONFIG_XEN_PRIVILEGED_GUEST=y CONFIG_XEN_PVHVM=y CONFIG_XEN_MAX_DOMAIN_MEMORY=500 CONFIG_XEN_SAVE_RESTORE=y CONFIG_PCI_XEN=y CONFIG_XEN_PCIDEV_FRONTEND=y CONFIG_XEN_BLKDEV_FRONTEND=y CONFIG_XEN_NETDEV_FRONTEND=y CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y CONFIG_HVC_XEN=y CONFIG_HVC_XEN_FRONTEND=y # CONFIG_XEN_WDT is not set # CONFIG_XEN_FBDEV_FRONTEND is not set # Xen driver support CONFIG_XEN_BALLOON=y # CONFIG_XEN_SELFBALLOONING is not set CONFIG_XEN_SCRUB_PAGES=y CONFIG_XEN_DEV_EVTCHN=y # CONFIG_XEN_BACKEND is not set CONFIG_XENFS=y CONFIG_XEN_COMPAT_XENFS=y CONFIG_XEN_SYS_HYPERVISOR=y CONFIG_XEN_XENBUS_FRONTEND=y CONFIG_XEN_GNTDEV=m CONFIG_XEN_GRANT_DEV_ALLOC=m CONFIG_SWIOTLB_XEN=y CONFIG_XEN_TMEM=y CONFIG_XEN_PRIVCMD=y CONFIG_XEN_ACPI_PROCESSOR=m Any ideas what I'm doing wrong here? Thanks a lot!

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• On linux, what does it mean when a directory has size 0 instead of 4096?

  - by kdt

  Here's a strange thing I haven't seen before -- a directory whose size is reported by ls as 0 instead of 4096, and I can't create any files within it. # ls -ld lib home drwxr-xr-x. 2 root root 0 Feb 7 03:10 home <-- it has zero size dr-xr-xr-x. 11 root root 4096 Feb 4 09:28 lib # touch home/foo touch: cannot touch `home/foo': No such file or directory <-- and I can't create files in it # rm home rm: cannot remove `home': Is a directory <-- look, it really is a dir So what does it mean for a directory to have size 0 instead of 4096? Filesystem is ext4 on fedora core 14. The output of mount is: /dev/mapper/vg_dev-lv_root on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/vda1 on /boot type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) Output of du -s /home: 0 /home Output of stat /home: File: `/home' Size: 0 Blocks: 0 IO Block: 1024 directory Device: 15h/21d Inode: 34913 Links: 2 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2011-02-07 03:45:46.188995765 -0800 Modify: 2011-02-07 03:11:59.980995019 -0800 Change: 2011-02-06 07:58:45.874995002 -0800

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• Execute encrypted files but don't let anybody read them.

  - by Stebi

  I want to provide a virtual machine image with an installed web application. The user should be able to boot the vm (don't login, just boot) and a webserver should start automatically. The point is I want to hide the (ruby) source code of the web application from everyone as there is no obfuscator for ruby. I thought I could use file system encryption to encrypt the directory with the sourcecode (or even a whole partition). But the webserver user must be able to read it automatically after booting. Nobody is allowed to login as the webserver user (or any other user) so no other can read the contents. My questions are now: Is this possible? Because I give away the whole vm everybody could mount its virtual discs and read them (except the encrypted one). Is it now possible to find the key the webserver user needs to decrypt the files and decrypt them manually? Or is it safe to give such a vm away? The problem is that everything needed to decrypt must be included somewhere in the vm else the webserver cannot start automatically. Maybe I'm completely wrong and you have another tip for me securing the source code.

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• Using Samba to share a folder from a Linux guest with a Windows host in VirtualBox

  - by AmV

  I would like to share a folder from a Linux Guest with a Windows host (with read and write access if possible) in VirtualBox. I read in these two links: here and here that it's possible to do this using Samba, but I am a little bit lost and I need more information on how to proceed. So far, I managed to set up two network adapters (one NAT and one host-only) and install Samba on the Linux guest, but now I have the following questions: What do I need to type in samba.conf to share a folder from the Linux guest? (the tutorial provided in one of the links above only explains how to share home directories) Are there any Samba commands that need to be executed on the guest to enable sharing? How do I make sure that these folders are only available to the host OS and not on the Internet? Once the Linux guest is setup, how do I access each of the individual shared folders from the Windows host? I read that I need to mount a drive on Windows to do this, but do I use Samba logins, or Linux logins, also do I use localhost? or do I need to set up an IP for this? Thanks!

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• How to get data out of a Maxtor Shared Storage II that fails to boot?

  - by Jonik

  I've got a Maxtor Shared Storage II (RAID1 mode) which has developed some hardware failure, apparently: it fails to boot properly and is unreachable via network. When powering it on, it keeps making clunking/chirping disk noise and then sort of resets itself (with a flash of orange light in the usually-green LEDs); it then repeats this as if stuck in a loop. In fact, even the power button does nothing now – the only way I can affect the device at all is to plug in or pull out the power cord! (To be clear, I've come to regard this piece of garbage (which cost about 460 €) as my worst tech purchase ever. Even before this failure I had encountered many annoyances about the drive: 1) the software to manage it is rather crappy; 2) it is way noisier that what this type of device should be; 3) when your Mac comes out of sleep, Maxtor's "EasyManage" cannot re-mount the drive automatically.) Anyway, the question at hand is how to get my data out of it? As a very concrete first step, is there a way to open this thing without breaking the plastic casing into pieces? It is far from obvious to me how to get beyond this stage; it opens a little from one end but not from the other. If I somehow got the disks out, I could try mounting the disk(s) on one of the Macs or Linux boxes I have available (although I don't know yet if I'd need some adapters for that). (NB: for the purposes of this question, never mind any warranty or replacement issues – that's secondary to recovering the data.)

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• All of the NTFS hard links disappear, where are hardlinks stored on disk and how to recover them?

  - by Osiris

  This is Windows 7 x64 sp1 on a NTFS file system. All hardlinks within C:\Windows\System32 folder disappear, and the Windows can't boot, because even the osloader, C:\Windows\System32\boot\Winload.exe also disappeared. Nevertheless, the original files are still located in the corresponding C:\Windows\winsxs folders. After booting into the Recovery Environment, and copied one Winload.exe (x64) from other folder, Windows gave an error pointing out that "ntoskrnl.exe is corrupted or missing...its file digital signature cannot be verified" In trying to boot in Safe Mode, the message above was shown after a screen prompting "Loaded \Windows\system32\config\system" Because at this early booting stage, smss.exe was still not loaded, so there is not any dumping and logs. Based on my study, ntoskrnl.exe depends on the following files: C:\\windows\\system32\\PSHED.DLL C:\\Windows\\System32\\hal.dll C:\\Windows\\System32\\kdcom.dll C:\\Windows\\System32\\clfs.sys C:\\Windows\\System32\\ci.dll All those files above are copied from their corresponding folders and verified their md5 with a well-operating Windows 7 x64 SP1. But the booting error is still the same: "ntoskrnl.exe is corrupted or missing..." **Background:** Before the reboot, there was an windows update going on. Then something unknown happen, almost all processes were broken to run, including the windows task manager, taskmgr.exe. After mount the hard disk to other computer, it seems that all hardlinks within C:\Windows\System32 folder were gone. I tried several data recovery software, but they are not be able to find those disappeared NTFS hard links. So the question is: Where are information about those hard links stored? And how to recover them? Are they depend on some windows service or stored in the registry?

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• Unix apt-get doesnt download from nfs locaiton

  - by pravesh

  I have switched to unix from last 3 months and trying to understand install process and in particular apt-get. I am able to successfully install and download the packages when I configure my repository on http location in /etc/apt/sources.list file. e.g. deb http://web.myspqce.com/u/eng/rose/debian-mirror-squeeze-amd64/mirror/ftp.us.debian.org/debian/ squeeze main contrib non-free This command will download(/var/cache/apt/archive) and install the package when i use apt-get install When I change the source location to file instead of http(nfs mount point), the package is getting installed but NOT getting downloaded in /var/cache/apt/archive. deb file:/deb_repository/debian-mirror-squeeze-amd64/mirror/ftp.us.debian.org/debian/ squeeze main contrib non-free Please let me know if there is any configuration or settings that i have to make to let apt-get to both download and install package when i use (nfs)file:/ instead of http:/ in sources.list. To achieve this, I can use apt-get --downlaod-only and then use apt-get install for both download and install in two separate calls, but I want to know why package is not getting downloaded with apt-get install but only getting installed when used with file:/ in sources.list

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• KVM and libvirt: How to configure a new disc device to an existing VM?

  - by initall

  I've got an Ubuntu 9.04 server running two VM's. In /etc/libvirt/qemu/machine1.xml two disk devices are defined like this: <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/vserver/machine1/disk0.qcow2'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='disk'> <source file='/vserver/machine1/disk1.qcow2'/> <target dev='hdb' bus='ide'/> </disk> I need more storage space in at least one of the devices and thought about adding a third hdc device by simply adding one with same style as above and re-organising my mount structure (The virtual sizes of the current qcow2 files are unfortunately limited.) My problem is that reloading libvirtd and restarting the VM do not result in a new visible device (checked with fdisk). I'm aware of extending an existing qcow2 file (converting to raw format, cat-ing/adding the new one, using smth. like gparted) - but only as a last resort. Hopefully it's something very simple I'm missing?

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• Ubuntu 13.10 - How to disable LVM and cryptsetup? cryptsetup: evms_activate is not available

  - by NeverEndingQueue

  I am trying to remove whole drive encryption from my Ubuntu installation. I've run Ubuntu from Live CD, mounted crypt partition and copied it to another partition /dev/sda3. sudo cryptsetup luksOpen /dev/sda5 crypt1 sudo dd if=/dev/ubuntu-vg/root of=/dev/sda3 bs=1M After that I've run boot-repair: https://help.ubuntu.com/community/Boot-Repair Added entry to /etc/fstab: UUID=<uuid> / ext4 errors=remount-ro 0 1 Of course I've replaced with blkid result of my /dev/sda3. I've also deleted overlayfs and tmpfs lines from /etc/fstab. (I've just compared it to content of /etc/fstab in non-encrypted Ubuntu installation and could not find overlayfs and tmpfs). I've chrooted from LiveCD into my system and rebuilt initramfs: http://blog.leenix.co.uk/2012/07/evmsactivate-is-not-available-on-boot.html I've also removed cryptsetup using apt-get remove. Basically I can easily mount my system partition from Live CD (without setting up the encryption and LVM stuff), but can not boot from it. Instead I see: cryptsetup: evms_activate is not available When I've chosen the Recovery mode I've seen this: Begin: Mounting root file system ... Begin: Running /script/local-top ... Reading all physical volumes. This may take a while ... No volume groups found cryptsetup: evms_activate is not available Begin: Waiting for encrytpted source device ... My /etc/crypttab is empty. I am pretty sure that system tries to find encrypted partition, search for LVMs etc. Do you have ideas what could be the problem or how can I fix it? Thanks

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• Move files from ftp server to s3

  - by lev

  I would like to set up an ftp server, where users will upload files, and for each file, put it on s3 storage, and delete it from the ftp server. (the server runs on ec2 ubuntu) Here are the stuff I already tried, with no success.. Mount s3 bucket using s3fs. I followed those instructions, but there is a bug in the latest version of s3fs, that prevents it from working. The bug was fixed on the develop branch, but I don't want to use unstable version on my production. Use vsftpd and using s3cmd sync via cron to sync the files periodically. The problem with that approach, is that s3cmd can start running in the middle of a file upload, and start synching the incomplete file. Also s3cmd doesn't give any feedback it the sync fails, so I have no way of knowing if I can delete the files after the sync command finished running. Use pure-ftpd's upload script feature (which allows to run a script after a file is finished uploading), but I noticed that if the file upload was failed in the middle, the script will run anyway, and I have no way of knowing if the upload was successful or not. I've been at it for a few days now, and I'm at a loss here. Any suggestions will be welcomed.

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• a brand new FS based on a database without using fuse

  - by Devrim

  hi all, To serve millions of files out of a single directory, being able to connect to a drive from hundreds of endpoints, and for some other reasons (to avoid gluster/nfs/all fs based networking solutions), I want to evaluate the possibility of making a filesystem that's based on a mongodb (or any other). Basically, it works like fusefs, every single file is kept in mongo gridfs. In theory, I do, mount mongodbfs /mountPoint mongodb://localhost then when i say touch /mountPoint/test.txt this file is inserted into mongodb. This FS will also store uid/gid and perms with the file, we can throw hundreds of servers to it, and no useradd will be necessary. I'm not thinking to include all the features of FS, just the ones we need. My question is, how do I start my quest in finding resources, books, links, people, developers who'd help me implement this? at least a proof of concept. Is it feasible? What should I expect as a timeline for such undertaking? Please only think about gazillion small files and folders.

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• Sparc Solaris 2.6 will not boot

  - by joshxdr

  I have a very old Sparc Solaris network that was working fine last week, but after a power outage none of the workstations will boot. The network looks like this: host A: solaris 2.6, shares /export/home to network by NFS host B: solaris 8, runs NIS server. Mounts /export/home/ by NFS. host C: RHEL5, shares /share to network by NFS. Mounts /export/home/ by NFS. I figured that the main problem was host A, since you need the home directories available for the other workstations to boot(?). Host A does not mount anything by NFS as far as I know. However, this workstation will NOT boot. The OBP bootup sequence looks like this: Boot device <blah> configuring network interface le0 Hostname <hostname> check file system <everything ok> check ufs filesystem <everything ok> NIS domainname is <name> starting router discovery starting rpc services: rpcbind keyserv ypbind done setting default interface for multicast: add net 224.0.0.0: gateway <hostname> <HANGS at this point> Is there some kind of debug mode so that I can get more detail as to why the workstation won't boot? Is my network structure inherently susceptible to power outage? Is there a way I can boot up to command line so I can at least turn off the NFS mounting?

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• centos install / partitioning

  - by ServerSideX

  I'm using NOC-PS to remotely install Centos 6.2 via KVM / IPMI. I'm going to install cPanel as well and they recommend this layout /boot (99MB) swap (2x server RAM) / (remainder) In the o/s install profile within NOC-PS software, it shows as this: part /boot --fstype ext2 --size 250 part pv.01 --size 1 --grow volgroup vg pv.01 logvol / --vgname=vg --size=1 --grow --fstype ext4 --fsoptions=discard,noatime --name=root logvol /tmp --vgname=vg --size=1024 --fstype ext4 --fsoptions=discard,noatime --name=tmp logvol swap --vgname=vg --recommended --name=swap By the time the default partition setup was done installing Centos, I get this [root@server005 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg-root 532G 907M 504G 1% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 243M 28M 202M 13% /boot /dev/mapper/vg-tmp 1008M 34M 924M 4% /tmp [root@server005 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Fri Dec 7 18:47:24 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg-root / ext4 discard,noatime 1 1 UUID=58b31aaf-5072-4fb1-a858-33bc316fa793 /boot ext2 defaults 1 2 /dev/mapper/vg-tmp /tmp ext4 discard,noatime 1 2 /dev/mapper/vg-swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 My question is, how should the NOC-PS install profile look like to get the recommended cPanel partitioning? The server has 16GB RAM, dual 600GB SAS drives and will be used for cPanel shared hosting.

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• file system that allow to specify different RAID level per directory and change it afterward

  - by Adam Ryczkowski

  I have 5 hard drives, where I want to keep my data. Some of my files are more important, and some of them are less. So some of them I wish to put on RAID-6, and for some it RAID-5 is sufficient. It is difficult to predict at the moment of creation of the arrays how much space of each type to declare. What I would do if I didn't hear about zfs, is partition the hard drives into identical 100GB partitions, and as my needs grow, assemble those partitions into md devices using linux-raid. Then, I'd combine those devices using lvm into logical volumes where I'd put my data. So when I'd need more space of e.g. RAID-6, I'd take 100GB partition from each hard drive and assemble them into another RAID-6 md device and would use it as physical storage for the logical volume group dedicated for RAID-6 data. Then I could grow the file system on this logical volume. On top of RAID-6 and RAID-5 Volume Groups (managed by lvm) would reside completely independent file systems, which I'd later merge with multiple mount --bind into a single directory structure that would reflect the logical structure of data rather that of the storage. But now, when I heard about the ZFS with all the performance, data-healing and compression capabilities I cannot stop thinking if it can help me. If so, what do you think would be the best setup?

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• copy large LVM volume(14TB) from one server to another

  - by bruce

  recently,I have to copy a very large LVM volume()rom server A to server B. Below is the filesystem of server A and server B - server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B . The server A and server B is in the same IP segment. IN the LVM volume on server A , there is all average 500M avi wmv mp4 etc. I tried mount /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS , then use cp command copy. It is clear I faild . Because the LVM volume is too big , I do not have good idea . I hope a good solution here. I'm a chinese, my english is very pool. sorry thanks everyone!

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• Rackspace Ubuntu 12.04 server stuck in initramfs after kernel upgrade

  - by Znarkus

  Can't boot after I did a aptitude full-upgrade and let it update menu.lst (did a diff first and it looked good). This is what I've done so far in the BusyBox shell: mkdir /tmp/xvda1 mount /dev/xvda1 /tmp/xvda1 chroot /dev/xvda1 nano /boot/grub/menu.lst This file looks like this: title Ubuntu 12.04.1 LTS, kernel 3.2.0-31-virtual root(hd0,0) kernel /boot/vmlinuz-3.2.0-31-virtual root=UUID=/dev/xvda1 ro quiet splash initrd /boot/initrd.img-3.2.0-31-virtual title Ubuntu 12.04.1 LTS, kernel 3.2.0-31-virtual (recovery mode) root(hd0,0) kernel /boot/vmlinuz-3.2.0-31-virtual root=UUID=/dev/xvda1 ro single initrd /boot/initrd.img-3.2.0-31-virtual titleUbuntu 12.04.1 LTS, kernel 3.2.0-24-virtual root(hd0,0) kernel/boot/vmlinuz-3.2.0-24-virtual root=UUID=/dev/xvda1 ro quiet splash initrd/boot/initrd.img-3.2.0-24-virtual titleUbuntu 12.04.1 LTS, kernel 3.2.0-24-virtual (recovery mode) root(hd0,0) kernel/boot/vmlinuz-3.2.0-24-virtual root=UUID=/dev/xvda1 ro single initrd/boot/initrd.img-3.2.0-24-virtual titleUbuntu 12.04.1 LTS, kernel 3.2.0-24-generic root(hd0,0) kernel/boot/vmlinuz-3.2.0-24-generic root=UUID=/dev/xvda1 ro quiet splash initrd/boot/initrd.img-3.2.0-24-generic titleUbuntu 12.04.1 LTS, kernel 3.2.0-24-generic (recovery mode) root(hd0,0) kernel/boot/vmlinuz-3.2.0-24-generic root=UUID=/dev/xvda1 ro single initrd/boot/initrd.img-3.2.0-24-generic titleChainload into GRUB 2 root(hd0,0) kernel/boot/grub/core.img titleUbuntu 12.04.1 LTS, memtest86+ root(hd0,0) kernel/boot/memtest86+.bin From what I remember, the upgrade added the UUID= string. Should I remove these? Or rather, how do I get my system back online again? Thanks. Update: Seems like I can't even edit the file. [ Error writing /boot/grub/menu.lst: Read-only file system ]

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• EC2 kernel decision and issues with creating a new machine with my AMI

  - by roacha

  I could really use some advice. I started a new instance on EC2 using Amazon's AMI and during the deployment process I selected a Kernel ID of "Use Default". I then configured my server the way that I wanted to and took a snapshot of it. I then created my own AMI to create new servers with. When I try and create a new server with this AMI the server fails to start and I get the error: EXT3-fs: sda1: couldn't mount because of unsupported optional features (240). Which appears to happen because I am selecting a kernel id of "Use default" again when building my second server. I have read that in order for this to work I need to choose the same kernel id that was used in my original server. I have deleted my original server and don't know what it was using. What is the best process to follow in order to not have these issues? Should I choose "Use Default" for my original server? How do you know which kernel it selected? Then should I just document this and always specify this during the deployment of my next servers using my custom AMI? OR should I choose a custom kernel id during the initial build and always use this one moving ahead hoping Amazon never retires it? Thanks for any advice!

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