> Right now we run the journal as a partition on the data disk. I've build > drives without journals and the write performance seems okay but random io > performance is poor in comparison to what it should be.
Co-located journals have multiple issues: o The disks are presented with double the number of write ops -- and lots of long seeks -- which impacts even read performance due to contention o The atypical seek pattern can collide with disk firmware and factory config in ways that result in a very elevated level of read errors. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
