From: "hzwulibin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <hzwulibin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
ceph-users <ceph-users-Qp0mS5GaXlQ@public.gmane.org>
Subject: Does SSD Journal improve the performance?
Date: Thu, 15 Oct 2015 09:29:03 +0800 [thread overview]
Message-ID: <201510150929011726350@gmail.com> (raw)
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Hi,
It should be sure SSD Journal will improve the performance of IOPS. But unfortunately it's not in my test.
I have two pools with the same number of osds:
pool1, ssdj_sas:
9 osd servers, 8 OSDs(SAS) on every server
Journal on SSD, one SSD disk for 4 SAS disks.
pool 2, sas:
9 osd servers, 8 OSDs(SAS) on every server
Journal on SAS disk itself。
I use rbd to create a volume in pool1 and pool2 separately and use fio to test
the rand write IOPS。here is the fio configuration:
rw=randwrite
ioengine=libaio
direct=1
iodepth=128
bs=4k
numjobs=1
The result i got is:
volume in pool1, about 5k
volume in pool2, about 12k
It's a big gap here, anyone can give me some suggestion here?
ceph version: hammer(0.94.3)
kernel: 3.10
hzwulibin@gmail.com
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