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Raid for SQL Server

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Hi guys,

I know this topic was discussed many time, I just think that my situation is a bit different so I wanted to hear your opinion.

I am migrating my SQL Server and at the moment I am in the process of buying new hardware.

I know that the ideal solution should be:

RAID 1 for OS

RAID 5 for database files

RAID 10 for log files

But as I cannot afford having RAID 5 and RAID 10 in the same server I need to decide whether to use RAID 5 or 10.

Now I know that you should always use RAID 10 for Databases but I run quesries to see the portion of read/writes on the database and got the following:

On mdf file:

number of R/W

Reads 82% 90 000

Writes 18% 20 000

On ldf file:

Read 5% 250

Writes 95% 5000

As I have to put mdf and ldf on the same drive, when I combine total Reads/Writes I got 90250 Reads and 25000 Writes...


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