Raid 5 performance

[Ralph Doncaster]

On Tue, 21 Sep 2004, Lennart Sorensen wrote:

> On Tue, Sep 21, 2004 at 04:40:50PM -0400, Ralph Doncaster wrote:
> > Make sure you use 3 or 5 disks, not 4.
> > Use hdparm to tune the transfer rates of each disk.
>
> Why not 4?  How would that cause any impact on a raid5 setup?

To avoid having to read from the odd data disk in order to calculate the
checksum when doing a write.

-Ralph

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