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 [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
