Hi everyone, we ran into an interesting performance issue on Friday that we were able to troubleshoot with some help from Greg and Sam (thanks guys), and in the process realized that there's little guidance around for how to optimize performance in OSD nodes with lots of spinning disks (and hence, hosting a relatively large number of OSDs). In that type of hardware configuration, the usual mantra of "put your OSD journals on an SSD" doesn't always hold up. So we wrote up some recommendations, and I'd ask everyone interested to critique this or provide feedback:
http://www.hastexo.com/resources/hints-and-kinks/solid-state-drives-and-ceph-osd-journals It's probably easiest to comment directly on that page, but if you prefer instead to just respond in this thread, that's perfectly fine too. For some background of the discussion, please refer to the LogBot log from #ceph: http://irclogs.ceph.widodh.nl/index.php?date=2013-01-12 Hope this is useful. Cheers, Florian -- Helpful information? Let us know! http://www.hastexo.com/shoutbox -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
