[Bug 372170] Re: intel isw raid metadata at odd offset

[Robert Collins]

On Sat, 2009-05-09 at 10:57 +0000, danwood76 wrote:
> You could do a probe for the ICH10 tag for now.
> That would probably be safer than guessing a dereference, then we need some more ICH10R based people to test which will take time.
> 
> You could try building another RAID set with a couple of other disks and
> see if the meta is in the same place on those disks also.

I think the ICH10 tag is actually a serial or some such; its at an odd
spot there.

What do you think of treating GAFR as a magic bytes, then using the
sector offset following that?

As long as the final location is checked for still being > 0 we won't
try to read negative offsets, and the followup is_isw call will fail on
non-isw environments.

It seems pretty safe to me to assume that:
find GAFR
follow a word sector offset
find a 10 byte isw signature

is only going to occur when someone actually has a ICH environment.

re testing: I don't have any disks I can wipe I'm sorry.

-Rob

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intel isw raid metadata at odd offset
https://bugs.launchpad.net/bugs/372170
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