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9.4

RAID 1 or 5 for an SQL database?

Asked by pbranz in MS SQL Server

Hi,

I will be recommending the purchase of a server that will be dedicated to running SQL Server. My question is, should we go with RAID 1 or 5? I have heard people say that for a database you always want to go with RAID 1, because the disks can do two independent reads at the same time. But I have read about, and worked with, many servers using RAID 5 that seemed to perform great. I've also heard that the transaction log should be on a different, mirrored device due to the sequential writes. Why does that make RAID 1 a good choice?

On the server we're setting up, there will be a good deal of both reading and writing. Which RAID type would be better? Are there any guidelines on choosing which RAID to use for SQL?
[+][-]02/07/03 07:10 AM, ID: 7903484Accepted Solution

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Zone: MS SQL Server
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Solution Provided By: angelIII
Participating Experts: 3
Solution Grade: A
 
[+][-]02/06/03 10:33 PM, ID: 7900768Expert Comment

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[+][-]02/06/03 11:51 PM, ID: 7900990Expert Comment

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[+][-]02/07/03 12:54 AM, ID: 7901233Expert Comment

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[+][-]02/07/03 07:05 AM, ID: 7903439Author Comment

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[+][-]02/07/03 09:18 AM, ID: 7904450Author Comment

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