[Lustre-discuss] RAID stripe width

[Kevin Van Maren]

The stripe width is the minimum amount of data that can be written to  
a raid (normally 5 or 6) without a read-modify-write operation -- the  
optimal minimum IO size.

Kevin

On Jun 24, 2009, at 8:57 AM, Carlos Santana <neubyr at gmail.com> wrote:

> Hi,
>
> What is stripe width? The lustre manual says,  <stripe_width> =
> <chunk_size> * ( <disks> - <parity_disks> ) <=1 MB. I am completely
> new to this field and I was looking for some RAID documentation
> online. Some people have mentioned that stripe width is the number of
> parallel stripes that can be written to or read from simultaneously -
> this equals number of disks in an array. Some thing is wrong with my
> understanding or interpretation of stripe width. Any elaboration on
> this and also on MTF and repair time calculation given in the manual?
> Any good guide on RAID?
>
> Thanks,
> CS.
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