[Lustre-discuss] Renaming an existing lustre filesystem

[Wojciech Turek]

Actually one correction to my earlier post you need to use --reformat option
with tunefs.lustre like this:

tunefs.lustre --reformat --fsname=<fsname> --writeconf
/dev/<block_device_name>

This is safe and no data will be lost, --reformat is just to force the
fsname change

BTW the rename procedure is in the manual but hidden under the "Restoring
the File System From a Snapshot" chapter

Cheers

Wojciech

On 2 March 2011 00:18, Wojciech Turek <wjt27 at cam.ac.uk> wrote:

> Hi James,
>
> It is possible and I did it around 3 years ago on lustre 1.6 but I think it
> still should work on 1.8
>
> Stop Lustre file system
> in order to change file system name run for each target:
> tunefs.lustre --fsname=<fsname> --writeconf /dev/<block_device_name>
> for each target do mount as ldiskfs file system. This need to be done on
> all OSS's and on MDS
> mount -t ldiskfs /dev/<device_name> /mnt/<target_mount_point>
> Delete file /mnt/<target_mount_point>/last_rcvd   # back it up before
> deleting just in case :)
> umount all targets
> Start filesystem using new name.
>
>
> On 1 March 2011 21:03, James Robnett <jrobnett at aoc.nrao.edu> wrote:
>
>>
>>   I asked a while back about renaming a lustre instance.
>>
>>   After a variety of failed attempts I finally just reverted
>> everything.  I'd still like to figure out the exact process
>> (or if it's trivially possible) for renaming a lustre instance.
>>
>>   It doesn't appear to be as simple as this on the MDS
>> tunefs.lustre --writeconf --mgs --mdt --fsname="foobar" /dev/XXX
>>
>>   and on the OSS
>>   tunefs.lustre --writeconf --mgsnode={MGS_IP_ADDR}@tcp0
>> --fsname="foobar" /dev/XXX
>>
>>    We have two distinct lustre installs with the name "lustre" and
>> I'd like to rename the test one to simplify parsing of
>> /proc/fs/lustre/llite/XXXX on the clients.
>>
>>   Some docs for 1.4 to 1.6 migration reference a --reformat option
>> but that has ugly connotations and it's not documented in the actual
>> tunefs.lustre man page, which itself claims won't reformat or destroy
>> data.
>>
>>    If there's no non-destructive way to do it that's fine.  If there's
>> an incredibly simple way and I'm being an idiot my apologies (but
>> I'd still like to know).
>>
>> James Robnett
>> NRAO/NM
>> ps: As mentioned in the original post
>> http://lists.lustre.org/pipermail/lustre-discuss/2011-February/015076.html
>> this is a simple 1.8.5 install with a combined MGS/MDT.
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>
>
>
>
> --
> Wojciech Turek
>
> Senior System Architect
>
> High Performance Computing Service
> University of Cambridge
> Email: wjt27 at cam.ac.uk
> Tel: (+)44 1223 763517
>



-- 
Wojciech Turek

Senior System Architect

High Performance Computing Service
University of Cambridge
Email: wjt27 at cam.ac.uk
Tel: (+)44 1223 763517
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