[ceph-users] Benchmark performance when using SSD as the journal

Dave.Chen at Dell.com Dave.Chen at Dell.com
Tue Nov 13 20:21:02 PST 2018

Hi all,

We want to compare the performance between HDD partition as the journal (inline from OSD disk) and SSD partition as the journal, here is what we have done, we have 3 nodes used as Ceph OSD,  each has 3 OSD on it. Firstly, we created the OSD with journal from OSD partition, and run "rados bench" utility to test the performance, and then migrate the journal from HDD to SSD (Intel S4500) and run "rados bench" again, the expected result is SSD partition should be much better than HDD, but the result shows us there is nearly no change,

The configuration of Ceph is as below,
pool size: 3
osd size: 3*3
pg (pgp) num: 300
osd nodes are separated across three different nodes
rbd image size: 10G (10240M)

The utility I used is,
rados bench -p rbd $duration write
rados bench -p rbd $duration seq
rados bench -p rbd $duration rand

Is there anything wrong from what I did?  Could anyone give me some suggestion?

Best Regards,
Dave Chen

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