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  • Recover LVM2 volume group after one HDD failed

    - by Bernd
    I had two HDDs, each one containing a LVM partition which formed a volume group. Then I had two LVs, one for my / directory and one for my /home/ directory. Yesterday where I had my / dir failed. I'm trying to recover at least my /home/ dir. What I've done so far: Boot a live system Extract LVM2 metadata from the working HDD using dd Copy metadata to /etc/lvm/backup/vg0 Now I'm trying to do this: pvcreate --restore /etc/lvm/backup/vg0 --uuid "[uuid of my working hdd]" /dev/sdb2 But I always get: Couldn't find device with uuid '[uuid of broken hdd]'. Couldn't find device with uuid '[uuid of working hdd]'. Device /dev/sdb2 not found (or ignored by filtering). I confirmed that /dev/sdb2 exists and I've commented out all filtering settings from /etc/lvm/lvm.conf so I don't know what might be causing pvcreate not to find the device. So: What might be the problem? Is it even possible to restore this partition? (As I'm writing this I'm starting to think it's impossible D:) Edit: Okay, looks like I've got it figured out. I was using a Ubuntu 8.10 CD (yeah, I know it's not supported anymore) and it seems that was the problem. When I started from a Ubuntu 10.04 CD everything worked 'fine', I could mount my LVM partitions partially without problems. (Will answer the question in 4 hours. But if anyone has still got some hints/tips, please share! :)

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  • 2 drives, slow software RAID1 (md)

    - by bart613
    Hello, I've got a server from hetzner.de (EQ4) with 2* SAMSUNG HD753LJ drives (750G 32MB cache). OS is CentOS 5 (x86_64). Drives are combined together into two RAID1 partitions: /dev/md0 which is 512MB big and has only /boot partitions /dev/md1 which is over 700GB big and is one big LVM which hosts other partitions Now, I've been running some benchmarks and it seems like even though exactly the same drives, speed differs a bit on each of them. # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 25612 MB in 1.99 seconds = 12860.70 MB/sec Timing buffered disk reads: 352 MB in 3.01 seconds = 116.80 MB/sec # hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 25524 MB in 1.99 seconds = 12815.99 MB/sec Timing buffered disk reads: 342 MB in 3.01 seconds = 113.64 MB/sec Also, when I run eg. pgbench which is stressing IO quite heavily, I can see following from iostat output: Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 231.40 0.00 298.00 0.00 9683.20 32.49 0.17 0.58 0.34 10.24 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 231.40 0.00 298.00 0.00 9683.20 32.49 0.17 0.58 0.34 10.24 sdb 0.00 231.40 0.00 301.80 0.00 9740.80 32.28 14.19 51.17 3.10 93.68 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb2 0.00 231.40 0.00 301.80 0.00 9740.80 32.28 14.19 51.17 3.10 93.68 md1 0.00 0.00 0.00 529.60 0.00 9692.80 18.30 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 0.60 0.00 4.80 8.00 0.00 0.00 0.00 0.00 dm-1 0.00 0.00 0.00 529.00 0.00 9688.00 18.31 24.51 49.91 1.81 95.92 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 152.40 0.00 330.60 0.00 5176.00 15.66 0.19 0.57 0.19 6.24 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 152.40 0.00 330.60 0.00 5176.00 15.66 0.19 0.57 0.19 6.24 sdb 0.00 152.40 0.00 326.20 0.00 5118.40 15.69 19.96 55.36 3.01 98.16 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb2 0.00 152.40 0.00 326.20 0.00 5118.40 15.69 19.96 55.36 3.01 98.16 md1 0.00 0.00 0.00 482.80 0.00 5166.40 10.70 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-1 0.00 0.00 0.00 482.80 0.00 5166.40 10.70 30.19 56.92 2.05 99.04 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 181.64 0.00 324.55 0.00 5445.11 16.78 0.15 0.45 0.21 6.87 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 181.64 0.00 324.55 0.00 5445.11 16.78 0.15 0.45 0.21 6.87 sdb 0.00 181.84 0.00 328.54 0.00 5493.01 16.72 18.34 61.57 3.01 99.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb2 0.00 181.84 0.00 328.54 0.00 5493.01 16.72 18.34 61.57 3.01 99.00 md1 0.00 0.00 0.00 506.39 0.00 5477.05 10.82 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-1 0.00 0.00 0.00 506.39 0.00 5477.05 10.82 28.77 62.15 1.96 99.00 And this is completely getting me confused. How come two exactly the same specced drives have such a difference in write speed (see util%)? I haven't really paid attention to those speeds before, so perhaps that something normal -- if someone could confirm I would be really grateful. Otherwise, if someone have seen such behavior again or knows what is causing such behavior I would really appreciate answer. I'll also add that both "smartctl -a" and "hdparm -I" output are exactly the same and are not indicating any hardware problems. The slower drive was changed already two times (to new ones). Also I asked to change the drives with places, and then sda were slower and sdb quicker (so the slow one was the same drive). SATA cables were changed two times already.

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  • IP address reuse on macvlan devices

    - by Alex Bubnoff
    I'm trying to create easy to use and possibly simple testing environment for some product and got some strange behaviour of macvlan's. What I'm trying to achieve: make a toolset for one-line start/stop of lxc containers(via docker) bound to external ip(I have enough of it on host machine). So, I'm doing something like this: docker run -d -name=container_name container_image pipework eth1 container_name ip/prefix_len@gateway and pipework here does this: GUEST_IFNAME=ph$NSPID$eth1 ip link add link eth1 dev $GUEST_IFNAME type macvlan mode bridge ip link set eth1 up ip link set $GUEST_IFNAME netns $NSPID ip netns exec $NSPID ip link set $GUEST_IFNAME name eth1 ip netns exec $NSPID ip addr add $IPADDR dev eth1 ip netns exec $NSPID ip route delete default ip netns exec $NSPID ip link set eth1 up ip netns exec $NSPID ip route replace default via $GATEWAY ip netns exec $NSPID arping -c 1 -A -I eth1 $IPADDR And it works for first time per IP. But for second time and later packets for containers IP isn't getting into container, while all configuration seem fine. So it looks like this: External machine ? ping 212.76.131.212 ....silence.... Host machine root@ubuntu:~# ip link show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip addr show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# tcpdump -v -i eth1 icmp tcpdump: WARNING: eth1: no IPv4 address assigned tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 00:00:46.542042 IP (tos 0x0, ttl 60, id 9623, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2345, length 64 00:00:47.549969 IP (tos 0x0, ttl 60, id 9624, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2346, length 64 00:00:48.558143 IP (tos 0x0, ttl 60, id 9625, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2347, length 64 00:00:49.566319 IP (tos 0x0, ttl 60, id 9626, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2348, length 64 00:00:50.573999 IP (tos 0x0, ttl 60, id 9627, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2349, length 64 ^C 5 packets captured 5 packets received by filter 0 packets dropped by kernel 1 packet dropped by interface Host machine, netns of container root@ubuntu:~# ip netns exec 32053 ip link show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip netns exec 32053 ip addr show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff inet 212.76.131.212/29 scope global eth1 inet6 fe80::b012:f7ff:fecc:a19d/64 scope link valid_lft forever preferred_lft forever root@ubuntu:~# ip netns exec 32053 tcpdump -v -i eth1 icmp tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes ....silence.... ^C 0 packets captured 0 packets received by filter 0 packets dropped by kernel So, can anyone say, what can it be? Can this be caused by not a bug in macvlan implementation? Is there any tools I can use to debug that configuration?

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  • could corosync can support unicast heartbeat mode?

    - by Emre He
    could corosync can support unicast heartbeat mode? from another thread in serverfault, some guy raised below corosync conf: totem { version: 2 secauth: off interface { member { memberaddr: 10.xxx.xxx.xxx } member { memberaddr: 10.xxx.xxx.xxx } ringnumber: 0 bindnetaddr: 10.xxx.xxx.xxx mcastport: 694 } transport: udpu } is this conf type means unicast mode? thanks, Emre

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  • opennms postgres connection slow

    - by krisdigitx
    i am running the opennms application server on a physical server and the database on an ESXi VM. Recently the opennms webconsole has been very slow to load as such i deleted most of the events from the database table, now both servers have no load at all, and the psql connection from the application server to the database server is also very fast, but somehow opennms webconsole is still slow. this is the strace from the opennms process id: 18629 futex(0x2aaac77d8a84, FUTEX_WAIT_PRIVATE, 453, NULL <unfinished ...> 3015 futex(0x2aaabc4a2ee4, FUTEX_WAIT_PRIVATE, 323, NULL <unfinished ...> 10863 futex(0x2aaabbebaa94, FUTEX_WAIT_PRIVATE, 395, NULL <unfinished ...> 25260 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 10859 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 10982 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 3011 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 25260 futex(0x2aaae098fc28, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 10982 futex(0x2aaac0eaf928, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 3011 futex(0x2aaab0cb1728, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 10859 futex(0x2aaac062c328, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 25260 <... futex resumed> ) = 0 10982 <... futex resumed> ) = 0 3011 <... futex resumed> ) = 0 10859 <... futex resumed> ) = 0 25260 futex(0x2aaabc38b6b4, FUTEX_WAIT_PRIVATE, 443, NULL <unfinished ...> 10982 futex(0x2aaabc5d7b94, FUTEX_WAIT_PRIVATE, 99, NULL <unfinished ...> 3011 futex(0x2aaac7c55334, FUTEX_WAIT_PRIVATE, 183, NULL <unfinished ...> 10859 futex(0x2aaabbb8c9d4, FUTEX_WAIT_PRIVATE, 347, NULL <unfinished ...> 10846 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 10846 futex(0x2aaae9022428, FUTEX_WAKE_PRIVATE, 1) = 0 10846 futex(0x2aaabe0030b4, FUTEX_WAIT_PRIVATE, 251, NULL <unfinished ...> 20281 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 14100 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 2925 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 10843 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 20281 futex(0x2aaac7e93628, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 14100 futex(0x2aaac04e8c28, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 2925 futex(0x2aaaec085528, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> 10843 futex(0x2aaab20b0528, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> and shows lots of connection timeout??? i think its the connection between the java application and database which is causing issues. any ideas how to troubleshoot this???

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  • Postfix + procmail - delivery fails because "can't create user output file" - on CentOS 6.2

    - by jshin47
    I verified that my postfix installation / relaying setup worked. Now I am having trouble with procmail. I have it wired to postfix with the following command: mailbox_command = /usr/bin/procmail -f -a "$USER" I have nothing in my procmail config but the following: LOGFILE=/var/procmailrc/log And I send an email to a recipient that previously worked (before I attached procmail). Now it fails with error: Apr 6 14:07:05 localhost postfix/qmgr[15194]: D0C3DFF6E1: from=<[email protected]>, size=938, nrcpt=1 (queue active) Apr 6 14:07:05 localhost postfix/local[1953]: D0C3DFF6E1: to=<[email protected]>, orig_to=<postmaster>, relay=local, delay=0.05, delays=0.02/0.01/0/0.02, dsn=5.2.0, status=bounced (can't create user output file. Command output: procmail: Couldn't create "/var/spool/mail/nobody" procmail: Couldn't read "//root" ) Apr 6 14:07:05 localhost postfix/bounce[1955]: warning: D0C3DFF6E1: undeliverable postmaster notification discarded Apr 6 14:07:05 localhost postfix/qmgr[15194]: D0C3DFF6E1: removed It seems like there is some sort of permissions issue but I do not know what the problem is, nor do I understand how I would go about diagnosing it further. The logfile that I specified is empty, by the way. How can I make procmail+postfix work?

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  • Amavisd start error

    - by Kristian
    I can't start amavis. It gives an error: Starting amavisd: Error in config file "/etc/amavis/conf.d/05-domain_id": Insecure directory in $ENV{PATH} while running with -T switch at /etc/amavis/conf.d/05-domain_id line 7. On line 7 is: chomp($mydomain = `head -n 1 /etc/mailname`); This problem occured after restaring my computer. I don't know much about amavis, so any help is appreciated. Regards, Kristian

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  • Diagnosing high CPU waiting

    - by Will
    I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 7.6%id, 23.4%wa, 0.0%hi, 0.2%si, 0.0%st Notice the HUGE %wa value, which as far as I know means a network or disk bottleneck. ifconfig shows no dropping packets and there's not a ton of bandwidth going on, so that leaves disk issues, right? There's not a lot of disk writing going on either...iotop is reporting we're only writing a little over 1 MB per second and the RAID tool reports everything is A-OK and write caching is enabled. How do I go about trying to figure out how to fix this? UPDATE: iostat -x output is: avg-cpu: %user %nice %system %iowait %steal %idle 0.62 0.10 0.31 9.65 0.00 89.31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.21 33.34 83.55 16.54 1599.94 399.07 19.97 43.21 416.98 3.71 37.13

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  • LS command for torrent files

    - by amir-beygi
    Hi all I have a directory full of torrent files,and i have to download all of them; But the problem is i have disk limit in my remote server,and file sizes are vary(100MB~8GB) and if i add all of torrent files ,none of them would be download completely;So i need a command to list all my torrents and the size of them , to be selected and add to download list later . NOTE: REMOTE SERVER - LINUX_UBUNTU_9.10 // SSH So i need a command like torrentls That output somethings like: file1.torrent 1111MB file2.torrent 222MB file3.torrent 3333MB file4.torrent 444MB file5.torrent 5555MB

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  • How do I enable SELinux when booting from a CD/DVD?

    - by JeffG
    I have a bootable DVD which boots the same Kernel as the Hard Drive (which uses SELinux). I have copied /etc/selinux and all the kernel modules to my ramdisk, and have tried both selinux=1 and selinux 1 as Kernel boot parameters. After the system boots, I check dmesg: % dmesg | grep -i selinux Kernel command line: initrd=idrd.img ramdisk_size=110476 selinux=1 SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability SElinux: Registering netfilter hooks But SELinux isn't running: % /usr/sbin/getenforce Disabled % /usr/sbin/setenforce 1 /usr/sbin/setenforce: SELinux is disabled /var/log/messages does not hold any clues. /proc/kmsg also has nothing

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  • How to fix bluescreen in windows 7 with multi-boot?

    - by Ismail Sensei
    I have HP laptop 6730S with two Operating systems : Windows 7 Ultimate 32bit Centos 6.4 64Bit The GRUB2 is not installed in MBR, use Windows' bootloader. After I choose Windows in the start, the blue-screen appears with unmountable_boot_volume problem so I tried some help from similar questions here ( use Command Prompt and enter the following command: chkdsk /R C: ). But the problem is, I can't get repair my computer it took so long and nothing happened after I waited more than 2H and when I put my Windows 7 DVD to boot it charge the files then same thing happened nothing show up so I couldn't use command prompt. But when I use Centos everything works just fine the D partition i can mounted normally but C partition it shows me error and tell me to go to windows and repair it with Chkdsk command and here is where I am stuck.

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  • FFMPEG: how to add watermark to video?

    - by DocWiki
    My Platform: Ubuntu 10.10 + FFMPEG 0.5.3(I installed ffmpeg from source) I try to add Watermark to a .MOV video with FFMPEG 0.5.3 imlib2.so (Please note FFMPEG 0.6+ dont support imlib2.so, so I use ffmpeg 0.5.3) Here is my code: ffmpeg -sameq -i example.mov -vhook '/usr/local/lib/vhook/imlib2.so -x 0 -y 0 -i /var/www/files/watermark.png' newexample.mov Here is the output: FFmpeg version 0.5.3, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --enable-avfilter --enable-filter=movie --enable-avfilter-lavf libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 1 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 libavdevice 52. 1. 0 / 52. 1. 0 libavfilter 0. 4. 0 / 0. 4. 0 built on Jul 3 2011 12:05:08, gcc: 4.4.5 Seems stream 1 codec frame rate differs from container frame rate: 59.94 (5994/100) - 29.97 (30000/1001) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'example.mov': Duration: 00:03:14.06, start: 0.000000, bitrate: 3350 kb/s Stream #0.0(eng): Audio: aac, 48000 Hz, stereo, s16 Stream #0.1(eng): Video: h264, yuv420p, 1150x647, 29.97 tbr, 29.97 tbn, 59.94 tbc Output #0, mov, to 'newexample.mov': Stream #0.0(eng): Video: mpeg4, yuv420p, 1150x647, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc Stream #0.1(eng): Audio: 0x0000, 48000 Hz, stereo, s16, 64 kb/s Stream mapping: Stream #0.1 - #0.0 Stream #0.0 - #0.1 Unsupported codec for output stream #0.1 What could be the possible problem? Is that AAC or H264 that is not supported? I installed libavcodec-extra-52, linfaac, libfaad and etc. but the error is the same. Do I have to install following this instruction? HOWTO: Install and use the latest FFmpeg and x264 or there is a simpler solution?

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  • Connect devices plugged into Raspberry Pi ethernet to WiFi network

    - by Tom
    I'm just starting out on a mission to learn more about networking and I've followed a tutorial (http://raspberrypihq.com/how-to-turn-a-raspberry-pi-into-a-wifi-router/) to turn my Raspberry Pi into a wifi router. That worked really well so I modified it slightly so that I can use a tethered iphone for the internet connection - I just switched all "eth0" references to "eth1" (the iphone interface) and added a script to set everything up when the phone is plugged in. This setup has freed up the Pi's ethernet port so I'd like to try and take this a step further and allow devices plugged into it to connect to the network. If possible, I'd like to try adding a switch so I can connect multiple devices. I've tried fiddling around with nat & iptables with no luck so my question is, how can I connect devices on eth0 to my wlan network?

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  • What useful things can one add to one's .bashrc ?

    - by gyaresu
    Is there anything that you can't live without and will make my life SO much easier? Here are some that I use ('diskspace' & 'folders' are particularly handy). # some more ls aliases alias ll='ls -alh' alias la='ls -A' alias l='ls -CFlh' alias woo='fortune' alias lsd="ls -alF | grep /$" # This is GOLD for finding out what is taking so much space on your drives! alias diskspace="du -S | sort -n -r |more" # Command line mplayer movie watching for the win. alias mp="mplayer -fs" # Show me the size (sorted) of only the folders in this directory alias folders="find . -maxdepth 1 -type d -print | xargs du -sk | sort -rn" # This will keep you sane when you're about to smash the keyboard again. alias frak="fortune" # This is where you put your hand rolled scripts (remember to chmod them) PATH="$HOME/bin:$PATH"

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  • Alternative to Windows Home Server (WHS) backups

    - by Adam Tegen
    Since Microsoft announced the end of life for WHS, are there any alternatives? Specifically, I am interested in recovering from a catastrophic disk failure with WHS. For example, this is my ideal scenario when a desktop hard-drive fails (has a bad virus, etc): Install a disk of the same size or greater Boot the desktop with the Recovery Disc Point the recovery application at the WHS Pick the machine, the drive(s) and the date of the backup Have a couple beers Reboot to a working machine as if nothing happened. I would need to slap multiple disks in the machine without raid. It sounds like LVM will work here. It would be nice, but not required to have de-duplication of files when multiple machines are backed up. (Single Instance Storage)

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  • ls hangs for a certain directory

    - by Jakobud
    There is a particular directory (/var/www), that when I run ls (with or without some options), the command hangs and never completes. There is only about 10-15 files and directories in /var/www. Mostly just text files. Here is some investigative info: [me@server www]$ df . Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_dev-lv_root 50G 19G 29G 40% / [me@server www]$ df -i . Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/vg_dev-lv_root 3.2M 435K 2.8M 14% / find works fine. Also I can type in cd /var/www/ and press TAB before pressing enter and it will successfully tab-completion list of all files/directories in there: [me@server www]$ cd /var/www/ cgi-bin/ create_vhost.sh html/ manual/ phpMyAdmin/ scripts/ usage/ conf/ error/ icons/ mediawiki/ rackspace sqlbuddy/ vhosts/ [me@server www]$ cd /var/www/ I have had to kill my terminal sessions several times because of the ls hanging: [me@server ~]$ ps | grep ls gdm 6215 0.0 0.0 488152 2488 ? S<sl Jan18 0:00 /usr/bin/pulseaudio --start --log-target=syslog root 23269 0.0 0.0 117724 1088 ? D 18:24 0:00 ls -Fh --color=always -l root 23477 0.0 0.0 117724 1088 ? D 18:34 0:00 ls -Fh --color=always -l root 23579 0.0 0.0 115592 820 ? D 18:36 0:00 ls -Fh --color=always root 23634 0.0 0.0 115592 816 ? D 18:38 0:00 ls -Fh --color=always root 23740 0.0 0.0 117724 1088 ? D 18:40 0:00 ls -Fh --color=always -l me 23770 0.0 0.0 103156 816 pts/6 S+ 18:41 0:00 grep ls kill doesn't seem to have any affect on the processes, even as sudo. What else should I do to investigate this problem? It just randomly started happening today. UPDATE dmesg is a big list of things, mostly related to an external USB HDD that I've mounted too many times and the max mount count has been reached, but that is an un-related problem I think. Near the bottom of dmesg I'm seeing this: INFO: task ls:23579 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ls D ffff88041fc230c0 0 23579 23505 0x00000080 ffff8801688a1bb8 0000000000000086 0000000000000000 ffffffff8119d279 ffff880406d0ea20 ffff88007e2c2268 ffff880071fe80c8 00000003ae82967a ffff880407169ad8 ffff8801688a1fd8 0000000000010518 ffff880407169ad8 Call Trace: [<ffffffff8119d279>] ? __find_get_block+0xa9/0x200 [<ffffffff814c97ae>] __mutex_lock_slowpath+0x13e/0x180 [<ffffffff814c964b>] mutex_lock+0x2b/0x50 [<ffffffff8117a4d3>] do_lookup+0xd3/0x220 [<ffffffff8117b145>] __link_path_walk+0x6f5/0x1040 [<ffffffff8117a47d>] ? do_lookup+0x7d/0x220 [<ffffffff8117bd1a>] path_walk+0x6a/0xe0 [<ffffffff8117beeb>] do_path_lookup+0x5b/0xa0 [<ffffffff8117cb57>] user_path_at+0x57/0xa0 [<ffffffff81178986>] ? generic_readlink+0x76/0xc0 [<ffffffff8117cb62>] ? user_path_at+0x62/0xa0 [<ffffffff81171d3c>] vfs_fstatat+0x3c/0x80 [<ffffffff81258ae5>] ? _atomic_dec_and_lock+0x55/0x80 [<ffffffff81171eab>] vfs_stat+0x1b/0x20 [<ffffffff81171ed4>] sys_newstat+0x24/0x50 [<ffffffff810d40a2>] ? audit_syscall_entry+0x272/0x2a0 [<ffffffff81013172>] system_call_fastpath+0x16/0x1b And also, strace ls /var/www/ spits out a whole BUNCH of information. I don't know what is useful here... The last handful of lines: ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(1, TIOCGWINSZ, {ws_row=68, ws_col=145, ws_xpixel=0, ws_ypixel=0}) = 0 stat("/var/www/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 open("/var/www/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 fcntl(3, F_GETFD) = 0x1 (flags FD_CLOEXEC) getdents(3, /* 16 entries */, 32768) = 488 getdents(3, /* 0 entries */, 32768) = 0 close(3) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 9), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3093b18000 write(1, "cgi-bin conf create_vhost.sh\te"..., 125cgi-bin conf create_vhost.sh error html icons manual mediawiki phpMyAdmin rackspace scripts sqlbuddy usage vhosts ) = 125 close(1) = 0 munmap(0x7f3093b18000, 4096) = 0 close(2) = 0 exit_group(0) = ?

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  • Help setting up NSD daemon (DNS server)

    - by Catalin
    While searching for a secure dns server I came across the NSD project. I was really impressed by what seemed to me the best option out there that's open source. One problem thought their 'tutorial' is really not beginner friendly. I have basic DNS knoledge but what's in there is out of my league. I need to have multiple sites on this CentOS server I've recently got my hands on. They also need to receive email. Details: I have a master host and would love to set this in the way described in the rows that follow: masterhost.com -> ns1.masterhost.com mail.masterhost.com www.masterhost.com addonhost.com -> ns1.masterhost.com mail.masterhost.com www.addonhost.com And so on. Any help in setting up this DNS server please? All answers and suggestions are welcomed. Thank you in advance.

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  • What amount of physical RAM would a typical "commodity class" server have, as of late 2013?

    - by marathon
    I'm trying to spec out servers for my company's infrastructure group to build. They tell me anything more than 2GB is too much, which I find ridiculous considering cheap DRAM is about 15 bucks a dimm in bulk and our particular software runs better with more memory. I tried to find out how much google servers use, and pinning down a number is hard. Best I could find in a google research paper was that in 2008, their commodity servers were using 2 and 4GB dimms, but the paper never said how many. I realize "commodity server" is a vague term, but I'm just looking for a rough range in RAM used. I suspect at least 16GB is going to be the norm.

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  • Passive Scan using wpa_supplicant-0.7.3

    - by Ashish Yadav
    I am using wpa_supplicant-0.7.3 and WL12xx TI Driver(WiFi) . Looking into both code,I seen that both support passive scan . Also, nl80211 driver is used (not wext). I am not able to find any command for passive scan in wpa_cli . With iw , for passive scan we can use : iw dev wlan0 scan passive Similar I want to do passive scan using wpa_supplicant . So need help to know how to do passive scan using wpa_supplicant?

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  • How do I align the bottom edges of two monitors with xrandr?

    - by denaje
    I have two outputs that I'd like to use on my laptop: LVDS1 - 1366x768 HDMI1 - 1920x1080 I set my monitors up like so: xrandr --output LVDS1 --auto --output HDMI1 --auto --right-of LVDS1 This is all well and good, but my laptop sits considerably lower than my external monitor, and with the top edges of the screens being aligned, it makes the jump from one screen to the other rather unintuitive. Is there a way I can align the bottom edges instead? I thought I could use the --pos flag to do this, but I have tried and not seen any difference (perhaps I do not know how to use it properly). EDIT: Solved. Thanks to tink's link, I deconstructed the Python script and discovered the way to do this is as follows: xrandr --output LVDS1 --pos 0x312 # 312 = 1280 - 768 xrandr --output HDMI1 --pos 1366x0 Not sure I understand exactly what the --pos flags are doing here, but it at least works!

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  • Easy way of daemonizing in CentOS 5.4

    - by Saif Bechan
    I know there is a program called upstart that can make it easy to make small daemons. I can't get this program to configure on CentOS. I get all sort of errors concerning pkg-congfig, libnih, and dbus. I am working on a node.ja application and this is a pain to start and stop all the time, so I want to create a deamon for this which makes it easy to start and stop.

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  • ntpd on Fedora Core 6 with high negative time reset values

    - by Mark White
    The basic problem is we have a FC6 server instance running on a virtual machine, and the system time seems to have been slowly varying until it is now causing a problem. The server runs 24/7 and has been up for 155 days. It has been changed to show GMT, and reports the time as (example) 00:15:15 GMT whereas the actual time is 00:00:00 GMT. This is an offset of 915 seconds. selinux has been changed to 'setenforce 0' for testing and I am running as root. I stop the ntpd service and change the time in System|Administration|Date & Time. The time still shows the same with 'date' in bash. There are no error logs. I change the date with 'date --set' in bash. The response confirms the changed date. I run 'date' and the incorrect date is shown. There are no error logs. I start the ntpd service and /var/log/messages shows success with 'time reset -915.720139s'. The date remains unchanged. ntpq -p shows three three time servers all have offsets of around -915 seconds. I stop ntpd service and try 'ntpd -gqx' and get the same result as above - success, but a large negative time reset. I've tried varying combinations of the above, and a few more settings in System|Administration|Date & Time - no change. I just need to reset the system time to GMT. No offset. But I can't wait for ntpd to slew the time over the next few weeks. Any advice is welcome, cheers! Surely this shouldn't be this difficult... Mark...

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