openstack/cinder
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Merge "VNX: Add constraints for async migration"

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Zuul 2019-01-08 20:26:20 +00:00 committed by Gerrit Code Review
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doc/source/configuration/block-storage/drivers/dell-emc-vnx-driver.rst
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@ -794,6 +794,18 @@ a volume is available for use.
To disable this feature, user can add ``--metadata async_migrate=False`` when
creating new volume from source.
**Constraints**
- Before the migration finishes, snapshots cannot be created from the source
volume, which could affect subsequent clones from the same source volume.
The typical affected use case is that creating volume-2 via cloning
volume-1 immediately after creating volume-1 via cloning volume-0. To achieve
so, users are advised to take any one of below actions:
1) wait for the first clone finishing, or
2) create volume-2 via cloning volume-0 instead of volume-1, or
3) create volume-1 with ``--metadata async_migrate=False``.
Best practice
~~~~~~~~~~~~~