The new kernel -108 did not help in my case, see also the following thread (which I will update as well)
http://forum.proxmox.com/threads/9097-vzdump-using-lvm-snapshot-kills-the-box?p=78898#post78898
This particular server is a Dell R815 - See below for storage specs. PERC H700, SAS - Proxmox 1.9 worked fine, we did a clean upgrade from 1.9 to 3.0.x (complete system wipe and reinstall)
I attempted a manual backup of one OpenVZ container last night, which failed locking the entire system up. I have tried OpenVZ containers and KVM virtual machines, there is no rhyme or reason to this problem. Log output below and version info. Looks like it completes one backup, the files are there (on a brand new NFS backup system I turned up yesterday) and then it just craps out. Kernel logs are visible here:
http://pastebin.com/UuiJ9Yz0
We have the same issue on a few brand new Dell R620s with the Perc H310 controller. Brand new clean installs of Prox 3.0.x - with only OpenVZ containers and local storage for backups. I have tried ext3 / ext4 and NFS mounts for vzdump backups, with the same results. I have also tried both deadline and CFQ schedulers as recommended.
I am happy to keep testing stuff out
Hope this helps.
Joe Jenkins
root@xx5:/var/log# vzdump 107 -storage ProxBackupsNFS
INFO: starting new backup job: vzdump 107 --storage ProxBackupsNFS
INFO: Starting Backup of VM 107 (openvz)
INFO: CTID 107 exist mounted running
INFO: status = running
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: trying to remove stale snapshot '/dev/xx5/vzsnap-xx5-0'
INFO: umount: /mnt/vzsnap0: not mounted
ERROR: command 'umount /mnt/vzsnap0' failed: exit code 1
INFO: Logical volume "vzsnap-xx5-0" successfully removed
INFO: creating lvm snapshot of /dev/mapper/xx5-vz ('/dev/xx5/vzsnap-xx5-0')
INFO: Logical volume "vzsnap-xx5-0" created
INFO: creating archive '/mnt/pve/ProxBackupsNFS/dump/vzdump-openvz-107-2013_07_31-21_34_17.tar'
INFO: Total bytes written: 3482634240 (3.3GiB, 5.9MiB/s)
INFO: archive file size: 3.24GB
^^ at this point backup hangs, load skyrockets, server requires reboot
top - 21:59:15 up 22:11, 3 users, load average: 195.39, 147.68, 79.54
Tasks: 1732 total, 1 running, 1731 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2.0 us, 0.3 sy, 0.0 ni, 75.0 id, 22.7 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 65954312 total, 42607184 used, 23347128 free, 784576 buffers
KiB Swap: 35651576 total, 0 used, 35651576 free, 27281784 cached
Write failed: Broken pipe
root@xx5:/mnt/pve/ProxBackupsNFS/dump# ls -la
total 12
drwxr-xr-x 3 root root 4096 Jul 31 21:45 .
drwxr-xr-x 4 root root 4096 Jul 31 15:26 ..
-rw-r--r-- 1 root root 3482634240 Jul 31 21:45 vzdump-openvz-107-2013_07_31-21_34_17.tar
drwxr-xr-x 2 root root 4096 Jul 31 21:34 vzdump-openvz-107-2013_07_31-21_34_17.tmp
root@xx5:/mnt/pve/ProxBackupsNFS/dump#
YY6G3
1
Assembly, Cable, PERC7, 2.5, R810, V2
0P77F
0
DISK PROGRAM..., FLASH..., FW6, S-FF
NU209
1
Battery, Primary, 7WHR, 1C Lithium Ion, PERCI
TCVRR
2
Power Supply, 1100W, Redundant, LITEON
XXFVX
1
Assembly, Card, PERCH700-INT, 512M, Serial Attached Scsi
G176J
1
Assembly, Carrier, Hard Drive SAS-SATAU, 2.5, V2
7260R
0
PREPARATION MATERIAL..., DEVIATION..., SERVICE CHARGE..., INCRS #2
X160K
1
HARD DRIVE..., 146G, SAS6, 10K, 2.5, SGT-FF