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.dil...@intel.com> wrote: > On Oct 13, 2016 19:02, Riccardo Veraldi <riccardo.vera...@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+lus...@mail.hebrew.edu> > wrote: > >>> On Fri, Oct 7, 2016 at 9:16 AM, Xiong, Jinshan < > jinshan.xi...@intel.com> wrote: > >>> > >>>>> On Oct 6, 2016, at 2:04 AM, Phill Harvey-Smith < > p.harvey-sm...@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@lists.lustre.org > >> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > >> > > > > _______________________________________________ > > lustre-discuss mailing list > > lustre-discuss@lists.lustre.org > > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > -- www: http://paciucci.blogspot.com
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