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[Elod Illes <1613770@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1613770

Title:
  Improve error log when instance snapshot fails

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New
Status in OpenStack Compute (nova) stein series:
  New
Status in OpenStack Compute (nova) train series:
  Fix Released

Bug description:
  If glance backend store is set to use filesystem storage and this
  storage is running out of space when if glance is trying to create a
  instance snapshot,  then in nova-compute log the following message is
  displayed:

  2016-08-08 22:24:31.644 TRACE oslo_messaging.rpc.server HTTPOverLimit: 413 Request Entity Too Large
  2016-08-08 22:24:31.644 TRACE oslo_messaging.rpc.server Image storage media is full: There is not enough disk space on the image storage media.
  2016-08-08 22:24:31.644 TRACE oslo_messaging.rpc.server (HTTP 413)

  It's a little bit annoying that we're logging the HTTP error from
  glance and that we don't specify the image uuid.

  Steps to reproduce:
  * set glance's config filesystem_store_datadir to small size filesystem
  * start nova instance
  * keep invoking "nova image-create" to create instance image snapshot, eventually the backend filesystem storage would run out of space
  * on nova-compute log see the HTTP error message above.

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