Hi, Am 08.12.2014 20:23, schrieb Sanders, Bill: > I've just stood up a Ceph cluster for some experimentation. Unfortunately, > we're having some performance and stability problems I'm trying to pin down. > More unfortunately, I'm new to Ceph, so I'm not sure where to start looking for > the problem. > 12x4TB spinners for OSD's (3.5 TB XFS + 10GB Journal partition on each disk) Well i guess this is the problem. You should not place the osd journal on the same physical disk. Try to put the journal on a separate disk or even better, on ssd. This will help alot. I would use 1 ssd per 4 OSDs and the ssd should sustain 400mb/sek writes (that's what those 4 4TB drives can handle sequential iirc) -- Mit freundlichen Grüßen, Florian Wiessner Smart Weblications GmbH Martinsberger Str. 1 D-95119 Naila fon.: +49 9282 9638 200 fax.: +49 9282 9638 205 24/7: +49 900 144 000 00 - 0,99 EUR/Min* http://www.smart-weblications.de -- Sitz der Gesellschaft: Naila Geschäftsführer: Florian Wiessner HRB-Nr.: HRB 3840 Amtsgericht Hof *aus dem dt. Festnetz, ggf. abweichende Preise aus dem Mobilfunknetz _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |