[linux-lvm] Cannot create more than 3 snapshots when system is busy
cfeng at plasmon.cn
cfeng at plasmon.cn
Fri Apr 8 09:01:12 UTC 2005
Dear all,
I have a problem with creating snapshots on the vanilla Linux2.6.11.5
kernel. I cannot create more than 3 snapshots on a logical volume when the
system is busy writing to the logical volume. When creating the fourth
snapshot the lvm.static just hangs there, and the process that writes data
to the logical volume also hangs. The system is still running though, and I
can access the system through ssh and do other things, but LVM subsystem is
hung. The filesystem on the logical volume is XFS and the physical volume
underneath is a RAID5. The following lines are from /proc/slabinfo which may
be useful:
dm-snapshot-in 128 140 56 70 1 : tunables 120 60 0 :
slabdata 2 2 0
dm-snapshot-ex 498095 498108 24 156 1 : tunables 120 60 0 :
slabdata 3193 3193 0
dm_tio 23549 52206 16 226 1 : tunables 120 60 0 :
slabdata 231 231 0
dm_io 23548 51754 16 226 1 : tunables 120 60 0 :
slabdata 229 229 0
Has anybody seen similar problem? Any suggestion would be greatly
appreciated!
Regards.
Charles
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