Re: [linux-lvm] Somewhat offtopic: Strange umount problem ....

[Klaus Strebel <klaus.strebel@agile.com>]

Rainer Krienke wrote:
> 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. 
>  

Hi Rainer,

is your NFS-server shutting down on reboot. That's typical behaviour for 
an NFS-Server. Perhaps an exportfs -au is missing. Shared filesystems 
cannot be umounted.

Ciao
Klaus
-- 
Klaus Strebel
UNIX-Engineer
<mailto:klaus.strebel@agile.com>

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