[Box Backup-dev] Userland RAID question

Martin Ebourne boxbackup-dev at fluffy.co.uk
Fri Apr 21 10:48:46 BST 2006


Chris Wilson <chris at qwirx.com> wrote:
> On Fri, 2006-04-21 at 08:55 +0100, Martin Ebourne wrote:
>> (the last disk is always the parity disk in RAID5).
>
> Maybe I'm splitting hairs, but I don't think that's strictly true. The
> parity in RAID 5 is divided between all the disks in a round-robin
> fashion, to avoid one disk becoming the bottleneck for all writes. I
> think that RAID 4 is where one disk holds all the parity.
> [http://en.wikipedia.org/wiki/RAID5#RAID_5]

You're right, and I did start to write that in my original email but  
realised I was late for work and thought I probably shouldn't be going  
too much into the implementation details of RAID5, so I just "lied",  
tut tut!

Martin.



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