cinder/releasenotes/notes/bp-powermax-protected-snap-...

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features:
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Dell EMC PowerMax driver: Added SRDF ``powermax:disable_protected_snap``
volume-type extra-spec property for the purpose of avoiding
overconsumption on both source and target storage arrays.
An operator may enable this functionality by creating a specific volume
type with the property::
"powermax:disable_protected_snap": "<is> True"
When disabled (which is the default and current behavior), a
replicated source volume will be protected with a snapshot of the
same volume type.
When enabled, snapshots of replicated source volumes will be treated
as regular, non-replicated devices.