Check out Varnish's configurable grace period. It will basically instruct it to ...

		chrismsnz on Nov 14, 2012 \| parent \| context \| favorite \| on: How Lanyrd moved from AWS to SoftLayer and MySQL t... Check out Varnish's configurable grace period. It will basically instruct it to continue to serve content that it considers "stale" (up to a point) until it is able to update it.