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RE: [Xen-users] xen 3.0 Test CD v1 released

To: "Richard Wackerbarth" <richard@xxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] xen 3.0 Test CD v1 released
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: 2005年11月26日 20:22:03 -0000
Cc: ian.pratt@xxxxxxxxxxxx
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Thread-topic: [Xen-users] xen 3.0 Test CD v1 released
> Dave,
>
> I got the same reaction when I first tried it. I was using 
> one of the later partitions for the XenTest data.
> When I changed that to the first partition (a /boot area that 
> has extra space) everything worked as expected.
>
> So I'm wondering if the error is really coming from an 
> attempt to read the HD for test status.
>
> Richard
We now understand this issue with the CD, and it turns out to be a bug
in grub (bug #14407). Grub's partition table handling doesn't reset
itself properly when going from an "extended" DOS partition on a HDD to
accessing a CD, and ends up trying to read from the CD at the same
offset as the logical partition table was on the drive. :(
Workarounds: 
 - Don't use an extended partition to save the state directory. 
 - Edit the boot commands to issue "root (hd0,0)" just before "root
(cd)", 
 which should unstick the partition table pointer. You'd have to do
 this on every boot, though. :(
 
Thanks,
Ian
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