Manage Block Storage scheduling

Manage Block Storage scheduling

As an administrative user, you have some control over which volume back end your volumes reside on. You can specify affinity or anti-affinity between two volumes. Affinity between volumes means that they are stored on the same back end, whereas anti-affinity means that they are stored on different back ends.

For information on how to set up multiple back ends for Cinder, refer to Configure multiple-storage back ends.

Example Usages

  1. Create a new volume on the same back end as Volume_A:

    $ cinder create --hint same_host=Volume_A-UUID SIZE
    
  2. Create a new volume on a different back end than Volume_A:

    $ cinder create --hint different_host=Volume_A-UUID SIZE
    
  3. Create a new volume on the same back end as Volume_A and Volume_B:

    $ cinder create --hint same_host=Volume_A-UUID --hint same_host=Volume_B-UUID SIZE
    

    Or:

    $ cinder create --hint same_host="[Volume_A-UUID, Volume_B-UUID]" SIZE
    
  4. Create a new volume on a different back end than both Volume_A and Volume_B:

    $ cinder create --hint different_host=Volume_A-UUID --hint different_host=Volume_B-UUID SIZE
    

    Or:

    $ cinder create --hint different_host="[Volume_A-UUID, Volume_B-UUID]" SIZE
    
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