I've never worked enough with rbd to be sure. I know for files, when I turned on striping, I got far better performance. It seems like for RBD, the default is:
Just to see if it helps with rbd, I would try stripe_count=4, stripe_unit=1mb... or something like that. If you tinker with these params, and they improve performance, let me know. -----Original Message----- From: Christian Kauhaus [mailto:k...@gocept.com] Sent: Friday, June 27, 2014 3:35 AM To: Aronesty, Erik; Udo Lembke; ceph-users@lists.ceph.com Subject: Re: [ceph-users] How to improve performance of ceph objcect storage cluster Am 26.06.2014 20:05, schrieb Aronesty, Erik: > Well, it's the same for rbd, what's your stripe count set to? For a small > system, it should be at least the # of nodes in your system. As systems > get larger, there's limited returns... I would imagine there would be some > OSD caching advantage to keeping the number limited (IE: more requests of the > same device = more likely the device has the next stripe unit prefetched). I'm trying to make sure I understand this: usually you can't set the stripe count directly, but you can set the default stripe size of RBD volumes. So in consequence, does this mean to go with a larger RBD object size than the default (4MiB)? Regards Christian -- Dipl.-Inf. Christian Kauhaus <>< · k...@gocept.com · systems administration gocept gmbh & co. kg · Forsterstraße 29 · 06112 Halle (Saale) · Germany http://gocept.com · tel +49 345 219401-11 Python, Pyramid, Plone, Zope · consulting, development, hosting, operations _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
