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---
features:
- |
Hitachi driver: Support Global-Active Device (GAD) volume.
GAD is a one of Hitachi storage fucntion uses volume replication
to provide a high-availability environment for hosts across storage
systems and sites. New properties will be added in configuration.
``hbsd:topology`` sets to ``active_active_mirror_volumex`` would
specify a GAD volume. ``hitachi_mirror_xxx`` parameters would
specify a secondary storage for GAD volume.
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