Re: Am I RAIDed or mirrored -- MIDRANGE-L

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Trevor Perry wrote:

Lukas,

Why would you not just add the disk to the RAID set and let it balance? It
is, after all, a fresh server with not a lot of DASD used yet.

Trevor

On 10/31/09 10:36 AM, "Lukas Beeler" <lukas.beeler@xxxxxxxxxxxxxxxx> wrote:

On Sat, Oct 31, 2009 at 15:20, Aaron Bartell <aaronbartell@xxxxxxxxx> wrote:

http://mowyourlawn.com/temp/Krengel-8203-E4A-V6R1-R7.pdf

0347 RAID Hot Spare Specify

If you want a 4 Drive RAID Array for enhanced performance, boot the
machine to DST and reconfigure the RAID array.

As far as i know, its better if you break the entire array and rebuild
it with 4 instead of just adding the 4th disk, but i'm not sure if
this is still the case.

Unless things have changed... A 3 drive raid set performs about like 2 mirrored drives as far as I/O speed/through-put. Just adding the 4th drive doesn't really fix the performance. Since all the parity info is still just on 2 drives, By stopping and restarting/rebuilding the set with 4 drives, parity will be on all 4 drives and they will see much better disk I/O performance.

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