On Aug 30, 2009, at 1:02 PM, Götz Reinicke <goetz.reinicke@xxxxxxxxxxxxxx e> wrote:
> Miguel Medalha schrieb:>>> what is your purpose with this Level? I'm asking because I had >>> done some>>> raid level tests some time ago with hardware raid controllers/ >>> systems>>> from 3ware, sun and iscsi-raidsystems and some softwareraid setups.>>>>>>> The purpose of using RAID 10 is, of course, performance coupled with>> full redundancy.>>>>>> I haven't seen significant performance differences using different>>> levels. (I'm not comparing the controllers.)>>>>>>> Did you test RAID 10 also?>>> I am using software RAID 10 with CentOS 5.3 and I surely did see a>> *huge* performance increase with RAID 10 compared to RAID 1 only.>> I tested 1+0 vers 0+1 vers 5 on the 3ware, the sun build in raid > system> and using softwareraid on an other (older) server.>> On the iscsi systems and the 3ware controller I tested raid 5 vers. > 6 as> well.>> May be I should have mentioned that.>> My conclusion on my systems was:>> Level 5 is the best concerning performance/capacity.
Then you were only testing sequential io an that only gets you so far. For random io nothing beats RAID10.
-Ross
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