Re: Got md request, not good (Raid 0.90 2.2.15pre17)

From: Stephen Frost (sfrost@ns.snowman.net)
Date: Wed Apr 05 2000 - 11:55:51 EST


On Wed, 5 Apr 2000, Ted Cabeen wrote:

> It tried applying the patches in the order you described and it didn't work.
> >From a brief lookover at the code, what it looks like to me is that the
> current set of RAID patches don't work well with nested arrays,
> particularly in the request code. With a single array, requests to
> portions of the disk are mapped to the correct portion of the physical disk
> that should hold that data. However, when you have an array on top of an
> array, what happens is that the request is mapped to the correct portion of
> the underlying raid array that makes up the top one, and that array doesn't
> then map it again onto an actual disk. Unfortunately, I don't see exactly
> where this is happening, or what steps should be taken to fix it.
> Can someone look into this and see what needs to be done to correctly map
> nested RAID requests? Thanks.

        Hrm, what type of RAID are you running? I've had RAID1 and RAID0
working w/o any problems so far. I'll try RAID5 here in a few minutes and
see how well it works.

                Stephen

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