Hi Dave,
The SSD journal will help boost iops & latency which will be more
apparent for small block sizes. The rados benchmark default block size
is 4M, use the -b option to specify the size. Try at 4k, 32k, 64k ...
As a side note, this is a rados level test, the rbd image size is not
relevant here.
Maged.
On 14/11/18 06:21, dave.c...@dell.com wrote:
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
_______________________________________________
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
