I've setup ceph cluster and using rbd to check the performance. Used ceph-deploy for deployment.
/dev/sdb - is data disk, /dev/sda4 - is journal. I've 2 servers running 2 osds and I 've 3 monitors running from vmware virtual machine. which has sufficient RAM/CPU. servers are dual core and i've 2 networks of 1Gbps(for osd dedicated 1gb network). There is a huge different when running " dd if=/dev/zero of=a1.temp bs=1k count=1023000". Gives only 22.5MB/s. where as vmware guest gives 92MB/s and physical gives 191 MB/s. I'm planning to use ceph for cloud and also for storing large image files. please let me know how to tune ceph to get an optimal performance. -Raj
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