[PVE-User] Backup Job Hang

[Muhammad Yousuf Khan]

i am using PVE 1.9, working great since few years
i have two 500 gigs of hard drives with out raid and making backup from
drive sda to sdb via using "SNAPSHOT" option.
 however one thing i am commonly observing is that whenever a backup job
with snapshort options runs some time it successfully complete and on the
other hand,  some times it hangs in a middle and create 2 files and 1
folder. <$vmname>.log, <$vmname.da?t and <$vmname>.tmp directory.
furthermore,  log doesn't show any error until unless i kill the process of
Vzdump. here is the log before and after killing the backup job process.

Feb 05 02:30:02 INFO: Starting Backup of VM 118 (qemu)
Feb 05 02:30:03 INFO: running
Feb 05 02:30:03 INFO: status = running
Feb 05 02:30:03 INFO: backup mode: snapshot
Feb 05 02:30:03 INFO: ionice priority: 7
Feb 05 02:30:03 INFO: trying to remove stale snapshot
'/dev/pve/vzsnap-lion-0'
Feb 05 02:30:05 INFO:   Logical volume "vzsnap-lion-0" successfully removed
Feb 05 02:30:06 INFO:   Logical volume "vzsnap-lion-0" created
Feb 05 02:30:06 INFO: creating archive
'/sdb_vmbackup/vzdump-qemu-118-2012_02_05-02_30_02.tgz'

*after killing the vzdump process which was hang for 1 days.
*
lion:/sdb_vmbackup# cat vzdump-qemu-118-2012_02_05-02_30_02.log
Feb 05 02:30:02 INFO: Starting Backup of VM 118 (qemu)
Feb 05 02:30:03 INFO: running
Feb 05 02:30:03 INFO: status = running
Feb 05 02:30:03 INFO: backup mode: snapshot
Feb 05 02:30:03 INFO: ionice priority: 7
Feb 05 02:30:03 INFO: trying to remove stale snapshot
'/dev/pve/vzsnap-lion-0'
Feb 05 02:30:05 INFO:   Logical volume "vzsnap-lion-0" successfully removed
Feb 05 02:30:06 INFO:   Logical volume "vzsnap-lion-0" created
Feb 05 02:30:06 INFO: creating archive
'/sdb_vmbackup/vzdump-qemu-118-2012_02_05-02_30_02.tgz'
Feb 05 02:30:06 INFO: adding
'/sdb_vmbackup/vzdump-qemu-118-2012_02_05-02_30_02.tmp/qemu-server.conf' to
archive ('qemu-server.conf')
Feb 05 02:30:06 INFO: adding '/mnt/vzsnap0/images/118/vm-118-disk-1.raw' to
archive ('vm-disk-ide0.raw')
Feb 06 12:54:19 INFO: umount: /mnt/vzsnap0: device is busy
Feb 06 12:54:19 INFO: umount: /mnt/vzsnap0: device is busy
Feb 06 12:54:19 ERROR: command 'umount /mnt/vzsnap0' failed with exit code 1
Feb 06 12:54:19 INFO:   Can't remove open logical volume "vzsnap-lion-0"
Feb 06 12:54:19 ERROR: command 'lvremove -f '/dev/pve/vzsnap-lion-0''
failed with exit code 5
Feb 06 12:54:19 ERROR: Backup of VM 118 failed - interrupted by signal

kindly help,

Thank you,
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