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Re: [Xen-devel] determining if a backend device is not working

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] determining if a backend device is not working
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 10 Mar 2009 10:00:59 +0000
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On 10/03/2009 09:21, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

>> I think we expect backends to always be responsive. So we have no
> model
>> for
>> what to do if that assumption breaks. Your particular example above
> sounds
>> like a weird backend bug?
> A block device definition of ',hdc:cdrom,r' appears to be valid on the
> qemu side of things. You just 'xm block-configure' it when you want to
> 'insert' a cdrom image into it.
> Blkback appears to not handle such things though, so it would have been
> nice to quickly detect that blkback wasn't doing anything useful and
> just move on...

So blkback currently just clams up in this case and won't let you connect at
all? I wonder if perhaps blkback isn't even configured in this case... Hmmm.

 -- Keir

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