[lustre-discuss] Migrate MGS to ZFS

[Andreas Dilger]

PS: it is always a good idea to make a backup of your MDT, since it is relatively small compared to the rest of the filesystem. A full-device "dd" copy doesn't take too long and is the most accurate backup for ldiskfs. 

Cheers, Andreas

> On Feb 19, 2019, at 19:31, Andreas Dilger <adilger at whamcloud.com> wrote:
> 
> Yes, it is possible to migrate the MGS files to another device as you propose. I don't think there is any particular difference if you move it to a separate ldiskfs or ZFS target. 
> 
> One caveat is that we don't test combined ZFS and ldiskfs targets on the same node, though in theory it would work. 
> 
> Migrating the MDT from ldiskfs to ZFS is also possible with newer versions of Lustre (2.12 for sure, I don't recall if it is in 2.10 or not).  You need to follow a special process to do this, please see the Lustre Operations Manual for details. 
> 
> Cheers, Andreas
> 
>> On Feb 19, 2019, at 17:48, Fernando Pérez <fperez at icm.csic.es> wrote:
>> 
>> Dear lustre experts.
>> 
>> Whats is the best way to migrate a MGS device to ZFS? Copy the CONFIGS/filesystem_name-* files from the old ldiskfs device to the new ZFS MGS device?
>> 
>> Currently we have a combined MDT/MGT under ldiskfs with lustre 2.10.4. 
>> 
>> We want to upgrade to lustre 2.12.0 and then separate the combined MDT/MGT and migrate MDT and MGT to separate ZFS devices. 
>> 
>> Regards.
>> =============================================
>> Fernando Pérez
>> Institut de Ciències del Mar (CMIMA-CSIC)
>> Departament Oceanografía Física i Tecnològica
>> Passeig Marítim de la Barceloneta,37-49
>> 08003 Barcelona
>> Phone:  (+34) 93 230 96 35
>> =============================================
>> 
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