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[Xen-devel] does 'xm save' compress?


  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Mon, 7 Feb 2011 23:13:17 +1100
  • Delivery-date: Mon, 07 Feb 2011 04:14:21 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcvGwGcuhHRDt/pAQamr+YBY5uD/Xg==
  • Thread-topic: does 'xm save' compress?

Does 'xm save' compress the data it writes to disk? Someone on another
(non-xen) mailing list pointed out that the bottleneck to a quick
shutdown/restore that didn't overly interrupt DomU's was the time taken
to suspend the DomU's on Dom0 shutdown and then resume them again on
Dom0 restart, and I can see the point, especially if the data wasn't
compressed and it had to write out every raw byte to disk...

James 

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