Very low disk performance on 5.x

[kama]

On Mon, 2 May 2005, Poul-Henning Kamp wrote:

> In message <427626DC.5030702 at centtech.com>, Eric Anderson writes:
>
> >Don't mean to be terse here, but I'm talking about the same test done an
> >two different RAID5 configurations, with different disks, and not just
> >me - other users in this very thread see the same issue..
>
> Uhm, if you are using RAID5 and your requests are not aligned and
> sized after the RAID5 you should *expect* read performance to be poor.
>
> If you your request ends up accessing two different blocks even just
> once per stripe, this totally kills performance.

My system is setup with RAID 1+0. So its not a RAID5 issue...