Xen users - May 2010 - what are /var/lib/xend/cpu.xml and /var/lib/xend/host.xml are for.

Hi,
I had a problem recently which was solved.
In folder /var/lib/xend/state two files cpu.xml and host.xml were corrupt.

The problem was due to some server operation  my hard disk was
full.When I rebooted I got error messages like
Starting xend failed.
This is not the exact error message but xend was failing to start.I
could not locate any error in my logs except
BLKTAPCTRL[3436]: Unable to start blktapctrl

what could have been the cause of xend failing to start.Right now
every thing is working.
I want to know what are /var/lib/xend/cpu.xml and
/var/lib/xend/host.xml are for.

-- 
Tapas

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