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[Matt Riedemann <mriedem@xxxxxxxxxx>]

Public bug reported:

CONF.block_device_allocate_retries in nova.compute.manager is used to
control how long nova waits for a volume it created in cinder to be
available when booting from volume and source != 'volume'.

In liberty, cinder landed some features for image cache:

https://review.openstack.org/#/c/195795/

And efficient transfer of images from glance:

https://review.openstack.org/#/c/201754/

The nova option help text should be updated to note that enabling the
image cache feature in cinder can help with tuning.

Given the complexity involved in
https://review.openstack.org/#/c/201754/ it might be best to just note
at least enabling the image cache feature in cinder
(https://review.openstack.org/#/c/195795/).

We'd also have to note that the feature is only available in cinder
starting in liberty, so liberty/mitaka nova talking to cinder < liberty
wouldn't work for the image cache feature.

** Affects: nova
     Importance: Low
     Assignee: Mark Doffman (mjdoffma)
         Status: Confirmed


** Tags: documentation low-hanging-fruit

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https://bugs.launchpad.net/bugs/1499518

Title:
  Docs for CONF.block_device_allocate_retries should be updated to note
  cinder image caching

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  CONF.block_device_allocate_retries in nova.compute.manager is used to
  control how long nova waits for a volume it created in cinder to be
  available when booting from volume and source != 'volume'.

  In liberty, cinder landed some features for image cache:

  https://review.openstack.org/#/c/195795/

  And efficient transfer of images from glance:

  https://review.openstack.org/#/c/201754/

  The nova option help text should be updated to note that enabling the
  image cache feature in cinder can help with tuning.

  Given the complexity involved in
  https://review.openstack.org/#/c/201754/ it might be best to just note
  at least enabling the image cache feature in cinder
  (https://review.openstack.org/#/c/195795/).

  We'd also have to note that the feature is only available in cinder
  starting in liberty, so liberty/mitaka nova talking to cinder <
  liberty wouldn't work for the image cache feature.

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