Re: [Xen-users] Stuck blkback

[Tom Fritz <tfritz@xxxxxxxxx>]

Greg,

> We have had a few occasions in the past few months where a VPS will need a hard 
> reboot.  After the
> command "xm shutdown" the VM would no longer boot.  I have traced this to the 
> device mapper device
> having an open count of 1, and then to the fact that there is a blkback process 
> running for a domain
> that doesn't exist.  I'm going to go out on a limb and suggest the blkback 
> device was for the VM in
> question.  I can't tell if this is a symptom or cause(the trouble with the 
> blkback process) however I
> don't know of any way to close out that backend process without a reboot so it 
> renders the LV
> unusable:/  Has anybody witnessed this behavior?

	Yes I have seen this a number of times om our production machines. 
It will render the machine unable to start/restart a VM. I have not been 
able to find a solution to the issue. If you figure something out I would 
be very interested in hearing about it.
Tom.

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