Thiemo Nagel wrote:
Bill Davidsen wrote:
16k read 64k write
chunk
size RAID 5 RAID 6 RAID 5 RAID 6
128k 492 497 268 270
256k 615 530 288 270
512k 625 607 230 174
1024k 650 620 170 75
What is your stripe cache size?
I didn't fiddle with the default when I did these tests.
Now (with 256k chunk size) I had
# cat stripe_cache_size
256
but increasing that to 1024 didn't show a noticeable improvement for
reading. Still around 550MB/s.
You can use blockdev to raise the readahead, either on the drives or the
array. That may make a difference, I use 4-8MB on the drive, more on the
array depending on how I use it.
Kind regards,
Thiemo
--
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
