On Aug 18, 2009, at 2:05 PM, mcclnx mcc <mcclnx at yahoo.com.tw> wrote: > We have several DELL servers with MD1000 connect to it. Server will > install CENTOS 5.x X86_64 version. My questions are: > > 1. Which configuration have better performance RAID5, RAID50 or > RAID60? RAID5 does one less IO per write as it doesn't have to write the extra parity, but RAID50 is a little worse then RAID6 because it has to calculate 2 parity blocks. If doing RAID6 I'd probably create one large RAID6, once you get into RAID60 it's probably just as well do RAID10. > 2. how much performance difference? That really depends on HW config, software config and workload. -Ross