They were some investigations as well around F2FS (https://www.kernel.org/doc/Documentation/filesystems/f2fs.txt), the last time I tried to install an OSD dir under f2fs it failed. I tried to run the OSD on f2fs however ceph-osd mkfs got stuck on a xattr test: fremovexattr(10, "user.test@5848273") = 0 Maybe someone from the core dev has an update on this? > On 24 Oct 2014, at 07:58, Christian Balzer <chibi@xxxxxxx> wrote: > > > Hello, > > as others have reported in the past and now having tested things here > myself, there really is no point in having journals for SSD backed OSDs on > other SSDs. > > It is a zero sum game, because: > a) using that journal SSD as another OSD with integrated journal will > yield the same overall result performance wise, if all SSDs are the same. > And In addition its capacity will be made available for actual storage. > b) if the journal SSD is faster than the OSD SSDs it tends to be priced > accordingly. For example the DC P3700 400GB is about twice as fast (write) > and expensive as the DC S3700 400GB. > > Things _may_ be different if one doesn't look at bandwidth but IOPS (though > certainly not in the near future in regard to Ceph actually getting SSDs > busy), but even there the difference is negligible when for example > comparing the Intel S and P models in write performance. > Reads are another thing, but nobody cares about those in journals. ^o^ > > Obvious things that come to mind in this context would be the ability to > disable journals (difficult, I know, not touching BTRFS, thank you) and > probably K/V store in the future. > > Regards, > > Christian > -- > Christian Balzer Network/Systems Engineer > chibi@xxxxxxx Global OnLine Japan/Fusion Communications > http://www.gol.com/ > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com Cheers. –––– Sébastien Han Cloud Architect "Always give 100%. Unless you're giving blood." Phone: +33 (0)1 49 70 99 72 Mail: sebastien.han@xxxxxxxxxxxx Address : 11 bis, rue Roquépine - 75008 Paris Web : www.enovance.com - Twitter : @enovance _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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