On Aug 30, 2009, at 1:02 PM, Götz Reinicke <goetz.reinicke at filmakademie.d 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