I've seen this "fast everything except sequential reads" asymmetry in my own simple dd tests on RBD images but haven't really understood the cause.
Could you clarify what's going on that would cause that kind of asymmetry. I've been assuming that once I get around to turning on/tuning read caching on my underlying OSD nodes the situation will improve but haven't dug into that yet. ~jpr On 04/04/2014 04:46 AM, Mark Kirkwood wrote: > However you may see some asymmetry in this performance - fast random and > sequential writes, fast random reads but considerably slower sequential > reads. The RBD cache may help here, but I need to investigate this > further (and also some of the more fiddly settings to do with vertio > disk config). _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
