PE2950 + Perc5i + SAS == SLOW

Andrew Hall andyjohnhall at gmail.com
Mon Nov 6 09:52:35 CST 2006


On 06/11/06, Claudio Nasuti <claudio.nasuti at acsys.it> wrote...

"It is a too conservative configuration on SAS raid.
You need to modify with openmanage or by BIOS the writing policy from
"Write-Through" to "Write Back" in so doing I obtained a write speed gain of 5X"

That's quite a general statement. I run a heavily loaded MySQL
database on a 2950 with 4x73GB SAS in a RAID10 array, and wouldn't
even consider changing to write-back.

Horses for courses, and all that :-)

http://www-903.ibm.com/kr/techinfo/xseries/download/write_back_vs_write_through.pdf



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