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?
2. how much performance difference?
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On Aug 18, 2009, at 2:05 PM, mcclnx mcc mcclnx@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:
- 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.
- how much performance difference?
That really depends on HW config, software config and workload.
-Ross
mcclnx mcc wrote:
We have several DELL servers with MD1000 connect to it. Server will install CENTOS 5.x X86_64 version. My questions are:
- Which configuration have better performance RAID5, RAID50 or RAID60?
That depends largely on how much cache the raid card has and how powerful the processor is. The more cache you have, the more you can have spikes in data throughput above the capacity of the disks go unnoticed (that is, no practical effect on disk performance) which will then leave choosing which raid level as an academic exercise in cost vs space. If your processor is not up to the job, go for raid10
- how much performance difference?
Really hard to say. Only testing will tell. There could be little difference or massive difference.
-
Christopher Chan -
mcclnx mcc -
Ross Walker