troubleshooting Question

RAID config options for SQL Server 2008

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IT_ServiceFlag for Canada asked on
Server HardwareComponentsMicrosoft SQL Server 2008
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I'm setting up a new database server.

It's running Win 2K8 Standard (SP2) with MS SQL 2008 (64-bit) Standard (SP1)

The E: drive (where the Database will reside), is a RAID5 array with 10 - 146 GB 15k rpm SAS drives.

My question is regarding the specific RAID settings. The RAID controller allows me to configure these options:

- Read Policy: No Read Ahead / Adaptive Read Ahead / Always Read Ahead

- Write Policy: Write Through / Always Write Back

- IO Policy: Direct IO / Cached IO

- Disk Cache Policy: Enabled / Disabled

Can someone comment on those options? When would it be beneficial to choose one setting as opposed to another?

Thanks!
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