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[Alan Pevec <1106423@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1106423

Title:
  grizzly: ability to specify the libvirt cache mode for disk devices

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) havana series:
  Fix Released
Status in OpenStack Manuals:
  Fix Released

Bug description:
  If https://review.openstack.org/#/c/18042/ is merged, a new
  configuration option/feature will be added to nova. The manuals should
  be updated to reflect this - configuration references and sample files

  In past versions of Nova it was possible to explicitly configure
  the cache mode of disks via the libvirt XML template. The curent approach
  makes this a derived setting of either “none” or “writethrough” based
  on the support of O_DIRECT. Whilst this provides a good set of default
  settings it removes the ability of the cloud provider to use other
  modes such as “writeback” and “unsafe” which are valuable in certain
  configurations.

  This change allows the cache mode to be specified on a per-disk type
  basis. Leaving the specify_cachemode option set to False retains the
  current behaviour.

   189	    cfg.ListOpt('disk_cachemodes',
     190	                 default=[],
     191	                help='Specific cachemodes to use for different disk types '
     192	                     'e.g: ["file=directsync","block=none"]'),
   189	    ]	193	    ]

  
  			317	        self.valid_cachemodes = ["default",
  			318	                                 "none",
  			319	                                 "writethrough",
  			320	                                 "writeback",
  			321	                                 "directsync",
  			322	                                 "writethrough",
  			323	                                 "unsafe",
  			324	                                ]

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