[linux-lvm] Somewhat offtopic: Strange umount problem ....
Rainer Krienke
krienke at uni-koblenz.de
Thu Mar 25 14:34:47 UTC 2004
Hello,
I have a problem with 3 server machines and I would as far as possible try to
isolate the bug which might be related to lvm or might not be. Perhaps
someone can help me where and how to look for the problem:
I am running 3 NFS and SMB servers (suse8.2; SuSE kernel 2.4.21-199, LVM
2.2.00.05) which run perfectly stable but show a strange behaviour
when rebooting the machines: The filesystems which contain user directories
cannot be umounted since the kernel claims that they are still busy. When I
switch to single user mode and run fuser -v or lsof on the mountpoints I
see no output. There are no more smb or other processes in the processlist
that might access the filesystems but nevertheless I cannot umount them.
The output of fuser -v shows only this:
USER PID ACCESS COMMAND
/export/user1 root kernel mount /export/user1
fuser -vm /export/user1 and lsof /export/user1 do not output anything.
The filesystems are xfs on top of LVM2 logical volumes which again run on
top of a md raid1 softmirror (the one and only physical vol) which is built
upon a md multipath device:
xfs_fs: LVM2: md_soft_raid1: md_multipath: Fibrechannel_hardware_raid_5
Basically all of the software except for LVM2 is a "original" suse 8.2
installation.
The problem when I cannot umount the filesystems is, that the software
mirror cannot be shut down cleanly so it is resynced when restarting the
machine (eg for a kernel security upgrade). Since the mirror has a size of
about 1TB this takes quite a long time. After all if one fine day during such
a unneeded resync the data source, one of two hardware raid5 arrays should
decide to fail then all the data on the mirror would be lost. At the moment
usually one IDE disk in one hardware raid dies duing the sync. If two disks
would die all the data could vanish in a big black hole.
Actually I do not know at the moment how to go on searching and I cannot
determine if eg LVM might be involved in this problem. So I would be very
greatful if someone could give me a hint or perhaps even say that this cannot
be a LVM problem.
Thanks for any help
Rainer
--
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Rainer Krienke, Universitaet Koblenz, Rechenzentrum, Raum A022
Universitaetsstrasse 1, 56070 Koblenz, Tel: +49 261287 -1312, Fax: -1001312
Mail: krienke at uni-koblenz.de, Web: http://www.uni-koblenz.de/~krienke
Get my public PGP key: http://www.uni-koblenz.de/~krienke/mypgp.html
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