On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Bill Davidsen wrote:
Justin Piszcz wrote:
I have found a 16MB stripe_cache_size results in optimal performance
after testing many many values :)
We have discussed this before, my experience has been that after 8 x
stripe size the performance gains hit diminishing returns, particularly
for typical write instead of big aligned blocks, possibly with O_DIRECT.
I would suggest that as a target even on a low memory machine.
Do your tests show similar? I was only able to test three and four drive
setups using dedicated drives.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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Running test with 10 RAPTOR 150 hard drives, expect it to take awhile
until I get the results, avg them etc. :)
128k,256k,512k,1024k,2048k,4096k,8192k,16384k
Justin.
Definitely a kernel bug, I set it to 64kb and it stayed in D-state until I
ran alt-sysrq-b.
Pretty nasty!
Justin.
Ack, help??
[ 64.032895] Starting XFS recovery on filesystem: md3 (logdev: internal)
[ 66.210602] XFS: xlog_recover_process_data: bad clientid
[ 66.210656] XFS: log mount/recovery failed: error 5
[ 66.210709] XFS: log mount failed
After I ran 64kb it killed my RAID!
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Yeah, I won't be trying that anymore :P
p34:/r1# find lost+found/|wc
157 157 3369
p34:/r1# du -sh lost+found/
166G lost+found/
p34:/r1#
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16MB is best performance per previous benchmarks.
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