Archive: Posts

To Improve CEPH performance for VMware, Install SSDs in VMware hosts, NOT OSD hosts.

SSDs deployed for caching in CEPH OSD servers are not very effective. The problem lies not in the SSDs, but because they are deployed at a point in the IO path that is downstream (in relation to VMs that run end user applications) of where the IO bottleneck is. This post looks at the performance shortcoming of CEPH and its solution. There are two options for improving the performance of CEPH. Option 1 is to deploy SSDs in CEPH OSD servers for journaling (write caching) and read...