On 01/20/2014 03:23 PM, grant wrote:
Hello, I’ve got a HWRAID with 10 NL-SAS HDDs. All of them used in logical volume RAID6. I’ve tried to benchmark created volume with FIO v2.1.4: # cat seqwrite.fio [write] blocksize=512k filename=/dev/sda rw=write direct=1 buffered=0 ioengine=libaio iodepth=1 runtime=10m numjobs=16 #./fio seqwrite.fio FIO returns: ... Run status group 0 (all jobs): WRITE: io=127958MB, aggrb=2132.5MB/s, minb=56530KB/s, maxb=229141KB/s..
Between some hardware raid buffering, large block transfers, and 100% sequential write you'll certainly be near optimal for sequential write I/O seen at each disk. 200MB/s/disk is higher than most folks would probably ballpark, but its not off by an order of magnitude or anything. I assume ~150MB/s sequential performance for most "good" consumer 7200RPM drives. Higher RPM alone could push you to ~200MB/s.
Try turning it into random I/O and if it goes to shit, then the results are probably as-expected ;) -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
