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 hzwuli...@gmail.com
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