On Wed, Apr 22, 2015 at 2:54 PM, Somnath Roy <Somnath.Roy@xxxxxxxxxxx> wrote: > What ceph version are you using ? Firefly, 0.80.9. > Could you try with rbd_cache=false or true and see if behavior changes ? As this is ZFS, running a cache layer below it that it is not aware of violates data integrity and can cause corruption, so that type of caching is not an option. > What is the client side cpu util ? Inside the VM, it appears fairly low: 0-2% user, 10-25% of one core in system, and the rest in wait I/O. On the KVM host it shows as 80-90% of one CPU core. > Performance also depends on the QD you are driving with. How is this set for a real-world virtual machine client (i.e. not synthetic workload like fio)? In practice, we have very little control over what ZFS does in terms of I/O. Thanks! _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |