Hi all,
OS: RHEL 6.3; Kernel: 2.6.32-279.el6.x86_64
4 x 6Gb/s SSD: 2 on 3Gb/s SATA, 2 on 6Gb/STA
fio-2.0.14
fio --name=rand --filename=/dev/sda:/dev/sdb:/dev/sdc:/dev/sdd
--ioengine=libaio --direct=1 --runtime=60 --blocksize=4K --rw=randread
--iodepth=8 --numjobs=128 --group_reporting
I have this unreasonable performance while testing with 3Gb SATA and
6Gb SATA together. 6Gb drive seems degraded to 3Gb perf when tested them
mixed. And the performance is normal while I measured 6Gb and 3Gb in two
seperate fio command lines concurrently.
Run r/w mix rand/seq iops
2 x 6Gb SSD 100% read RAND 158000
2 x 3Gb SSD 100% read RAND 100000
4 SSD 1 fio 100% read RAND 205000
4 SSD con 2 fio 100% read RAND 260000
Not sure whether this is a bug in fio...
--
Regards,
Jash Zhu
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