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[Pranali Deore <pranalideore@xxxxxxxxx>]

Public bug reported:

Currently QoS can be applied on instances with nova flavors[1]. But, it will not get applied if user is booting instance from image to volume bdm.
  
For cinder volumes, qos specs can be associated with specified volume type after setting qos by "cinder qos-create" which can be attached to the instance[2].

But incase of multiple volume types it's not possible to provide the
specific volume_type during instance boot from image to volume.

Volume_type name can be mentioned in "cinder.conf" with
'default_volume_type' parameter incase of single volume_type.

With this 'default_volume_type' option, if you create new instance from
image to volume bdm, volume will get created with provided volume type
where QoS is set.

But, if there are multiple volume types then "default_volume_type"
option is not valid.

So, for cinder volumes, 2 steps needs to be performed,
1. create volume with qos using cinder.
2. boot from volume using nova.


Can we reduce it to single step ? May be by:

1.  providing option to select volume type while booting new instance from volume.
Or
2. Applying QoS defined in nova flavors to cinder volumes.


[1] https://wiki.openstack.org/wiki/InstanceResourceQuota
[2] http://paste.openstack.org/show/563825/

** Affects: nova
     Importance: Undecided
     Assignee: Pranali Deore (pranali-deore)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Pranali Deore (pranali-deore)

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https://bugs.launchpad.net/bugs/1617265

Title:
  Unable to apply QoS to volume in single step while booting instance
  from image to volume.

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently QoS can be applied on instances with nova flavors[1]. But, it will not get applied if user is booting instance from image to volume bdm.
    
  For cinder volumes, qos specs can be associated with specified volume type after setting qos by "cinder qos-create" which can be attached to the instance[2].

  But incase of multiple volume types it's not possible to provide the
  specific volume_type during instance boot from image to volume.

  Volume_type name can be mentioned in "cinder.conf" with
  'default_volume_type' parameter incase of single volume_type.

  With this 'default_volume_type' option, if you create new instance
  from image to volume bdm, volume will get created with provided volume
  type where QoS is set.

  But, if there are multiple volume types then "default_volume_type"
  option is not valid.

  So, for cinder volumes, 2 steps needs to be performed,
  1. create volume with qos using cinder.
  2. boot from volume using nova.

  
  Can we reduce it to single step ? May be by:

  1.  providing option to select volume type while booting new instance from volume.
  Or
  2. Applying QoS defined in nova flavors to cinder volumes.


  
  [1] https://wiki.openstack.org/wiki/InstanceResourceQuota
  [2] http://paste.openstack.org/show/563825/

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