[Lustre-discuss] Changing lustre network numbers...

[Ms. Megan Larko]

Lustre InfiniBand network IP change is now working.

Solution:
I had checked the /etc/modprobe.conf file.  We are still using lnet
"o2ib" so it has not changed.
I did the tunefs.lustre commands properly on the OSTs.
I redid the tunefs.lustre command on the MGS/MDS again according to
the Lustre manual section 4.2.3.

The key part seems to be unmounting all lustre disks (OSTs and MDTs).
Running "lustre_rmmod" immediately followed by "modprobe_lustre".
Then on the OSS computers, "mount -a -t lustre"  (assuming a correct
/etc/fstab entry, of course).
Next on the MGS/MDS,  "mount -a -t lustre"
Check the recovery_stats in the /proc system.

I then had no problem mounting my lustre disks on any of my client systems.

The stopping and starting of lustre via "lustre_rmmod" seems to have
been critical.

Thank you for such a timely response with your suggestions.

megan



On Tue, Dec 9, 2008 at 2:54 PM, Cliff White <Cliff.White at sun.com> wrote:
>
>>
>> Did you have all servers and clients down before you did the renumbering
>> and only bring them backup after completing the the tunefs.lustre
>> commands?
>
> Also, rememember when changing LNET stuff, you must unload/reload all Lustre
> modules - umount/mount isn't enough.
>
> Looking at your logs - did you allow the MDS to complete recovery before
> attempting to connect clients?
>
> cliffw
>
>>
>> There is a brief section in the manual about changing server NIDs at
>>
>> http://manual.lustre.org/manual/LustreManual16_HTML/ConfiguringLustre.html#50548784_pgfId-1289827.
>>  Maybe that will be helpful.
>>
>> b.
>>
>>
>>
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>
>