Re: Ceph Performance

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Hi!

How much replication are you using? Also, what kind of disk is this? Was the 191MB/s number to one of the drives on one of the servers? You may also find that running concurrent dd's improve your numbers.

Thanks,
Mark

On 08/29/2013 12:44 PM, raj kumar wrote:
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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