Re: [ceph-users] rbd bench-write vs dd performance confusion

2016-01-04 Thread Snyder, Emile
Ah, thanks, that makes sense. I see bug 14225 opened for the backport. I'm looking at http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO_backport_commits, I'll see if I can get a PR up for that. -emile On 1/4/16, 3:11 PM, "Jason Dillaman" wrote: >There was a bug in the rbd CLI bench-

Re: [ceph-users] rbd bench-write vs dd performance confusion

2016-01-04 Thread Jason Dillaman
There was a bug in the rbd CLI bench-write tool that would result in the same offset being re-written [1]. Since writeback cache is enabled (by default), in your example only 4MB would be written to the OSD at the conclusion of the test. The fix should have been scheduled for backport to Hamme