Found my initial problem, my network interface that was being used for lustre 
communication (myrinet) didn't come up after the kernel upgrade this time. I 
resolved that, rebuilt everything from scratch, and have have an upgraded 
lustre 1.6.4.3 running on my MGS and OSS nodes. However, I'm getting this 
message on the MGS when I converted my last oss node:

Sep 24 19:44:34 mymds kernel: Lustre: upgrading server lustre-OST0001 from 
pre-1.6
Sep 24 19:44:34 mymds kernel: LustreError: 14c-9: lustre-client is supposedly 
an old log, but no old LOV or MDT was found. Consider updating the 
configuration with --writeconf.
Sep 24 19:44:34 mymds kernel: LustreError: 149-c: Failed to find lustre-OST0001 
in the old client log. Apparently it is not part of this filesystem, or the old 
log is wrong.
Sep 24 19:44:34 mymds kernel: Use 'writeconf' on the MDT to force log 
regeneration.
Sep 24 19:44:39 mymds kernel: Lustre: upgrading server lustre-OST0003 from 
pre-1.6
Sep 24 19:44:39 mymds kernel: LustreError: 14c-9: lustre-client is supposedly 
an old log, but no old LOV or MDT was found. Consider updating the 
configuration with --writeconf.
Sep 24 19:44:39 mymds kernel: LustreError: 149-c: Failed to find lustre-OST0003 
in the old client log. Apparently it is not part of this filesystem, or the old 
log is wrong.
Sep 24 19:44:39 mymds kernel: Use 'writeconf' on the MDT to force log 
regeneration.


I can't mount a lustre client yet so I assume this is directly related, any 
suggestions are welcomed.

Thanks again,
-Nathan




On 9/24/08 10:06 AM, "Nathan" <[EMAIL PROTECTED]> wrote:

Yes it is a symlink. I just now tried mounting the actual block device and am 
getting the same error unfortunately. Thanks for the suggestion though.

-Nathan


On 9/24/08 2:59 AM, "Andreas Dilger" <[EMAIL PROTECTED]> wrote:

On Sep 23, 2008  17:55 -0400, Heald, Nathan T. wrote:
> When I try to start it I get an error (Same error for an upgrade or fresh 
> install):
>
> [EMAIL PROTECTED] lustre]# mount -t lustre /dev/mpath/mpath2 /mnt/test/mdt
> mount.lustre: mount /dev/mpath/mpath2 at /mnt/test/mdt failed: No such device
> Are the lustre modules loaded?
> Check /etc/modprobe.conf and /proc/filesystems
> Note 'alias lustre llite' should be removed from modprobe.conf

Is /dev/mpath/mpath2 a symlink to some real block device?  That can cause
problems in some cases.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.


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