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5.10.2. Never-ending live migration

Live migration can fail to complete, which leaves migration in a perpetual running state. A common reason for a live migration that never completes is that client requests to the instance running on the source Compute node create changes that occur faster than the Compute service can replicate them to the destination Compute node.

Use one of the following methods to address this situation:

  • Abort the live migration.
  • Force the live migration to complete.

Aborting live migration

If the instance state changes faster than the migration procedure can copy it to the destination node, and you do not want to temporarily suspend the instance operations, you can abort the live migration.

Procedure

  1. Retrieve the list of migrations for the instance: 

    $ nova server-migration-list <vm>

    Replace <vm> with the name or ID of the instance.

  2. Abort the live migration: 

    $ nova live-migration-abort <vm> <migration-id>
    • Replace <vm> with the name or ID of the instance.
    • Replace <migration-id> with the ID of the migration.

Forcing live migration to complete

If the instance state changes faster than the migration procedure can copy it to the destination node, and you want to temporarily suspend the instance operations to force migration to complete, you can force the live migration procedure to complete.

重要

Forcing live migration to complete might lead to perceptible downtime.

Procedure

  1. Retrieve the list of migrations for the instance: 

    $ nova server-migration-list <vm>

    Replace <vm> with the name or ID of the instance.

  2. Force the live migration to complete: 

    $ nova live-migration-force-complete <vm> <migration-id>
    • Replace <vm> with the name or ID of the instance.
    • Replace <migration-id> with the ID of the migration.