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We have HP ProLiant DL370 G6 server with HP SA P410i raid controller, running under CentOS 5.5 x86_64. Some configuration details: 24Gb RAM, 10xHDD SAS 3,5'' 15krpm in RAID1+0, 50/50 read/write in accel. settings, ext3 filesystem. I did some tests with IOzone and there are counters: What are you think about I/O performance? Are these counters generally good or bad for such configuration? Thanks.

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Yes, that's pretty good to be honest, certainly the cache seems more write-biased than a 50/50 split would suggest and your test hasn't blown out the cache so it's difficult to see the real write performance but random reads are pretty good. Overall I'd be happy.

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Chopper3, thank you for your answer! I don't realise, why it so write-biased, I set it to 50/50 manually. Previously, I had 25/75 ratio, it was set by HP vendor by default, even more biased to write. BTW, what do you think about this article?… Author said, that he increased performance by changing I/O scheduler in OS, but I'm personally afraid to play such games with the system. – Denis Nov 17 '10 at 9:28
That is a REALLY good article Denis, thank you for bringing it to my attention - I'd say that not only are the changes the writer used impressive but they're also really applicable to you as the 400 and 410 are essentially the same controller - these tuning changes are not hard to achieve and I really think you should go for it! Well done. – Chopper3 Nov 17 '10 at 10:12
There is with the changed scheduler option: And this is with the scheduler option and 8MB of read ahead cache: I'm going to stay with the last options set ("noop" in sched. + 8MB cache). – Denis Nov 18 '10 at 6:02
Wow - huge benefit, really glad that worked out for you. – Chopper3 Nov 18 '10 at 9:15

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