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Don
Asked: 2011-12-08 14:29:47 +0800 CST

Which RAID caching policy to use?

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I'm in the process of setting up a server. Dell PE R510, 6 450GB HD. It came with all drives RAID 5'd, I'm wanting to wipe the configuration and set 0 and 1 as RAID 1, then 2-5 as RAID 5. When I go to setup RAID 1, it's asking me about which Caching Policy to use - Read/Write, Write only, Read only, and none. I'm not sure which to pick here...suggestions? This server will be used for Exchange 2010 and the RAID 1 drives will be used for the OS and Logs, and the server will be on a battery backup. Thanks in advance.

raid

1 Answers

  1. Best Answer

    The RAID write cache policy should be set depending on the disk I/O load. You must make sure that you have a battery on the RAID controller and that the battery is functional.

    The cache policy settings can be changed at any time from Dell OMSA.

    I suggest to start with write caching disabled and only if you have problems with the I/O to change the write cache policy.

    I would use RAID10 only instead of splitting that stuff in a RADI5 and RAID1 volumes.

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