[lustre-discuss] Migrate MGS to ZFS

[Andreas Dilger]

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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