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Re: Couple more fixes for Linux raid metadata 1.x support

From: Lennart Sorensen
Subject: Re: Couple more fixes for Linux raid metadata 1.x support
Date: Mon, 26 Jul 2010 13:20:34 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

On Sat, Jul 24, 2010 at 06:22:02AM -0400, Doug Nazar wrote:
>  While doing some in-depth testing came across a few more issues. The  
> second one really threw me for a loop. The LVM wouldn't come up because  
> it couldn't find some of the raid arrays but when I hexdumped the raid  
> arrays it showed the correct uuid. Applies on top of previous patch.
> - Ignore spare and faulty drives
> - Set a dynamic array->number. It's used for the disk->id and is important
>   for the cache subsystem that it be unique.

I just tried this patch with a fresh checkout.  I still can't get grub
to read my 1.x raids (That I just created using the debian installer
daily build).

If I use 0.9 raid, it seems to work fine.

I keep getting errors like:

Welcome to GRUB!                                                                
error: read error on block: 18446744073709551360.                               
error: no such disk.                                                            
Entering rescue mode...                                                         
grub rescue>

Now this is on a powerpc64 system, so it is big endian.  That number by
the way is FFFFFFFFFFFFFF00.

I wonder if some part of the 1.x raid handling code has an endianess bug.

Got any guesses I can try before I just go convert back to 0.9 raids?
I really hate giving up on things that ought to work and loose the
debugging opportunity.

Len Sorensen

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