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@xxxxxxxxx
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