Re: Performance Impact of going from 2 parity drives to 4 paritydrives in a 4-disk RAID set -- MIDRANGE-L

Good News Everybody!

The new search engine is LIVE!

Please report any problems to david (at) midrange.com.

Subject: Re: Performance Impact of going from 2 parity drives to 4 paritydrives in a 4-disk RAID set
From: "Lukas Beeler" <lukas.beeler@xxxxxxxxxxxxxxxx>
Date: Thu, 21 Aug 2008 23:37:46 +0200
List-archive: <http://archive.midrange.com/midrange-l>
List-help: <mailto:midrange-l-request@midrange.com?subject=help>
List-id: Midrange Systems Technical Discussion <midrange-l.midrange.com>
List-post: <mailto:midrange-l@midrange.com>
List-subscribe: <http://lists.midrange.com/mailman/listinfo/midrange-l>, <mailto:midrange-l-request@midrange.com?subject=subscribe>
List-unsubscribe: <http://lists.midrange.com/mailman/listinfo/midrange-l>, <mailto:midrange-l-request@midrange.com?subject=unsubscribe>

On Thu, Aug 21, 2008 at 11:05 PM, Charles Wilt <charles.wilt@xxxxxxxxx> wrote:

You are saying there's a performance improvement going from a 4-disk
RAID 5 that only uses 2 parity drives to a 4-disk RAID 5 that uses all
4 drives for parity.

That's what I expected, but IBM is telling us otherwise.

Well, there, writes will be more balanced. Currently, parity writing
is forced on 2 disks, so your write speed will suffer.

However, the amount by which the performance will increase might or
might not be large, depending on what you're doing.

This mailing list archive is Copyright 1997-2026 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.