Hi,
We test sync iops with fio sync=1 for database workloads in VM,
the backend is librbd and ceph (all SSD setup).
The result is sad to me. we only get ~400 IOPS sync randwrite with
iodepth=1
to iodepth=32.
But test in physical machine with fio ioengine=rbd sync=1, we can reache
~35K IOPS.
seems the qemu rbd is the bottleneck.
qemu version is 2.1.2 with rbd_aio_flush patched.
rbd cache is off, qemu cache=none.
So what's wrong with it? Is that normal? Could you give me some help?
Thanks very much.
_______________________________________________
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
