We are days away from completing our production CloudStack / Ceph deployment but have run into a small challenge in regards to Ceph performance. As you run a setup similar to ours I was wondering if you’ve seen a similar issue?
Our Ceph cluster consists of 60 X 7.2K SAS drive, spread over 5 nodes each with a 960GB Samsung NVMe. Our KVM hypervisors are connected to this nodes via 2 x 10Gbps links, per node.
3 centos Cloudstack management servers 4.11.0
4 centos KVM hosts
The RAW Ceph performance looks great!
However when we run the tests from within KVM we get significantly reduced performance, particular in writes:
We believe the libvirt/ceph library could be causing the problem with in centos as we don’t see this on a Ubuntu KVM HOST
Adam Witwicki | Hosted Systems Specialist
01380 710278 / awitwicki@xxxxxxxxxxxxx