I would suggest splitting OSDs across two or more SSD journals (depending on OSD write speed and SSD sustained speed limits)
e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 OSDs (it may vary depending on the setup) If you RAID-1 SSD journals they will potentially "wear out" in the same time due to writes happening on both of them. You only going to get journal write performance penalty with RAID-1. Dominik On Wed, Aug 5, 2015 at 3:37 PM, Dominik Zalewski <dzalew...@optlink.co.uk> wrote: > I would suggest splitting OSDs across two or more SSD journals (depending > on OSD write speed and SSD sustained speed limits) > > e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 > OSDs (it may vary depending on the setup) > > If you RAID-1 SSD journals they will potentially "wear out" in the same > time due to writes happening on both of them. > > You only going to get journal write performance penalty with RAID-1. > > Dominik > > On Tue, Aug 4, 2015 at 10:54 PM, SUNDAY A. OLUTAYO <olut...@sadeeb.com> > wrote: > >> I am thinking of having ceph journal on a RAID1 SSD. >> >> Kindly advise me on this, does the RAID1 SSD for journal make sense? >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >
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