[lustre-discuss] zpool features, recordsize, post-upgrade?

[Jongwoo Han]

Hi Marion,

Enabling PFL and relocating file will double space consumption, so safe way
is not to enable new features. Among other things, compression may be a
good idea to try but remember it will increase OSS CPU utilization.

Regards,
Jongwoo Han

On Tue, Oct 9, 2018 at 9:00 AM Marion Hakanson <hakansom at ohsu.edu> wrote:

> Greetings,
>
> We're upgrading our Lustre servers from CentOS-6 with IEEL-2.3, to
> CentOS-7.5 with Lustre community release 2.10.5.  The OSTs are all
> on the ZFS backend, originally built on ZoL-0.6.5.
>
> The new 2.10.5 servers come with ZoL-0.7.9, which of course has some
> new zpool features available.
>
> Once we've upgraded, should we enable one or more of the new features
> in our existing OST zpools?  E.g. large_blocks?  And then update the
> ZFS recordsize to whatever a newly-created Lustre 2.10.5 OST would use?
>
> I do realize the new recordize setting wouldn't affect existing files,
> but we're also looking at enabling PFL and doing a global "lfs migrate"
> operation to re-layout everything for better performance.
>
> Thoughts?  Anyone else been down this road?
>
> Thanks and regards,
>
> Marion
>
> _______________________________________________
> lustre-discuss mailing list
> lustre-discuss at lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>


-- 
Jongwoo Han
+82-505-227-6108
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20181010/fe7035c7/attachment.html>