[lustre-discuss] Quick ZFS pool question?

[PGabriele]

you can have a better understanding of the gap from this presentation: ZFS
metadata performance improvements
<http://www.eofs.eu/_media/events/lad16/02_zfs_md_performance_improvements_zhuravlev.pdf>

On 14 October 2016 at 08:42, Dilger, Andreas <andreas.dilger at intel.com>
wrote:

> On Oct 13, 2016 19:02, Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it>
> wrote:
> >
> > Hello,
> > will the lustre 2.9.0 rpm be released on the Intel site ?
> > Also the latest rpm for zfsonlinux  available is 0.6.5.8
>
> The Lustre 2.9.0 packages will be released, when the release is complete.
> You are welcome to test the pre-release version from Git, if you are
> interested.
>
> You are also correct that the ZoL 0.7.0 release is not yet available.
> There are still improvements when using ZoL 0.6.5.8, but some of these
> patches only made it into 0.7.0.
>
> Cheers, Andreas
>
> > On 13/10/16 11:16, Dilger, Andreas wrote:
> >> On Oct 13, 2016, at 10:32, E.S. Rosenberg <esr+lustre at mail.hebrew.edu>
> wrote:
> >>> On Fri, Oct 7, 2016 at 9:16 AM, Xiong, Jinshan <
> jinshan.xiong at intel.com> wrote:
> >>>
> >>>>> On Oct 6, 2016, at 2:04 AM, Phill Harvey-Smith <
> p.harvey-smith at warwick.ac.uk> wrote:
> >>>>>
> >>>>> Having tested a simple setup for lustre / zfs, I'd like to try and
> >>>>> replicate on the test system what we currently have on the production
> >>>>> system, which uses a much older version of lustre (2.0 IIRC).
> >>>>>
> >>>>> Currently we have a combined mgs / mds node and a single oss node.
> >>>>> we have 3 filesystems : home, storage and scratch.
> >>>>>
> >>>>> The MGS/MDS node currently has the mgs on a seperate block device and
> >>>>> the 3 mds on a combined lvm volume.
> >>>>>
> >>>>> The OSS has an ost each (on a separate disks) for scratch and home
> >>>>> and two ost for storage.
> >>>>>
> >>>>> If we migrate this setup to a ZFS based one, will I need to create a
> >>>>> separate zpool for each mdt / mgt / oss  or will I be able to create
> >>>>> a single zpool and split it up between the individual mdt / oss
> blocks,
> >>>>> if so how do I tell each filesystem how big it should be?
> >>>> We strongly recommend to create separate ZFS pools for OSTs,
> otherwise grant, which is a Lustre internal space reserve algorithm, won’t
> work properly.
> >>>>
> >>>> It’s possible to create a single zpool for MDTs and MGS, and you can
> use ‘zfs set reservation=<space> <target>’ to reserve spaces for different
> targets.
> >>> I thought ZFS was only recommended for OSTs and not for MDTs/MGS?
> >> The MGT/MDT can definitely be on ZFS.  The performance of ZFS has been
> >> trailing behind that of ldiskfs, but we've made significant performance
> >> improvements with Lustre 2.9 and ZFS 0.7.0.  Many people use ZFS for the
> >> MDT backend because of the checksums and integrated JBOD management, as
> >> well as the ability to create snapshots, data compression, etc.
> >>
> >> Cheers, Andreas
> >>
> >> _______________________________________________
> >> lustre-discuss mailing list
> >> lustre-discuss at lists.lustre.org
> >> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
> >>
> >
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>
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