> We have the plan to run ceph as block storage for openstack, but from test > we found the IOPS is slow. > > Our apps primarily use the block storage for saving logs (i.e, nginx's > access logs). > How to improve this? There are a number of things you can do, notably: 1. Tuning cache on the hypervisor http://ceph.com/docs/master/rbd/rbd-config-ref/ 2. Separate device OSD journals, usually SSD is used (no longer seeking between data and journal volumes on a single disk) 3. Flash based writeback cache for OSD data volume https://github.com/facebook/flashcache/ http://bcache.evilpiepirate.org/ If you have any questions let us know! -- Kyle _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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