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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => kilo-3

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https://bugs.launchpad.net/bugs/1421707

Title:
  Differential data not carrying over on resize up

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The differential data (data committed to the disk after the initial
  snapshot is created, but before the VM is shutdown) does not seem to
  be carried over on resizes up on standard instances. This can be
  tested by doing the following:

  1. Create a cronjob that writes the time to a log file once every minute (* * * * * date >> /root/resize-test.log).
  2. Resize the server up.
  3. Examine the log file after the resize is complete, then revert the resize.
  4. Compare it with the log file on the source after the revert is complete.

  Data from the log file in one of my tests:
  Destination (post-resize, pre-revert):

  Sat Jan 31 12:10:01 UTC 2015
  Sat Jan 31 12:11:01 UTC 2015
  Sat Jan 31 12:12:01 UTC 2015
  Sat Jan 31 12:13:01 UTC 2015
  Sat Jan 31 12:14:01 UTC 2015
  Sat Jan 31 12:15:01 UTC 2015
  Sat Jan 31 12:16:01 UTC 2015
  Sat Jan 31 12:17:01 UTC 2015
  Sat Jan 31 12:18:01 UTC 2015
  Sat Jan 31 12:19:01 UTC 2015
  Sat Jan 31 12:25:01 UTC 2015
  Sat Jan 31 12:26:01 UTC 2015
  Sat Jan 31 12:27:01 UTC 2015
  Sat Jan 31 12:28:01 UTC 2015
  Sat Jan 31 12:29:01 UTC 2015
  Sat Jan 31 12:30:01 UTC 2015
  Sat Jan 31 12:31:01 UTC 2015
  Sat Jan 31 12:32:01 UTC 2015
  Sat Jan 31 12:33:01 UTC 2015
  Sat Jan 31 12:34:01 UTC 2015

  Source (post-resize, post-revert):

  Sat Jan 31 12:04:01 UTC 2015
  Sat Jan 31 12:05:01 UTC 2015
  Sat Jan 31 12:06:01 UTC 2015
  Sat Jan 31 12:07:01 UTC 2015
  Sat Jan 31 12:08:01 UTC 2015
  Sat Jan 31 12:09:01 UTC 2015
  Sat Jan 31 12:10:01 UTC 2015
  Sat Jan 31 12:11:01 UTC 2015
  Sat Jan 31 12:12:01 UTC 2015
  Sat Jan 31 12:13:01 UTC 2015
  Sat Jan 31 12:14:01 UTC 2015
  Sat Jan 31 12:15:01 UTC 2015
  Sat Jan 31 12:16:01 UTC 2015
  Sat Jan 31 12:17:01 UTC 2015
  Sat Jan 31 12:18:01 UTC 2015
  Sat Jan 31 12:19:01 UTC 2015
  Sat Jan 31 12:20:01 UTC 2015 <-
  Sat Jan 31 12:21:01 UTC 2015 <- 3 minutes worth of logs that didn't get copied over.
  Sat Jan 31 12:22:01 UTC 2015 <-
  Sat Jan 31 12:38:01 UTC 2015

  Another way to make this bug obvious is to write multiple GB of data
  during the resize up process and notice how it is entirely lost when
  the resize completes.

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