[lustre-discuss] Migrate MGS to ZFS

[Fernando Perez]

Thank you Andreas.

I will try to migrate the MGS according my previous idea, based in the 
lustre operations manual section for separate a combined MDT/MGS.

I agree that the dd backup of the current combined MDT/MGS is mandatory 
before try to perform the migration.

Regards.

=============================================
Fernando Pérez
Institut de Ciències del Mar (CSIC)
Departament Oceanografía Física i Tecnològica
Passeig Marítim de la Barceloneta,37-49
08003 Barcelona
Phone:  (+34) 93 230 96 35
=============================================

On 2/20/19 4:33 AM, Andreas Dilger wrote:
> 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
>>> =============================================
>>>
>>> _______________________________________________
>>> lustre-discuss mailing list
>>> lustre-discuss at lists.lustre.org
>>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org