43d851abba
This patch adds support for trim/discard to 3 Dell EMC drivers: - PowerStore - PowerMax - PowerFlex Support is added to report this capability to both Nova, via the 'discard' value in connection properties, as well as internally to Cinder, via the 'sparse_copy_volume' driver capability. PowerStore and PowerMax only support thin volumes, so they will always report the trimming capability, but the PowerFlex also supports thick volumes, so it will only be returned for thin volumes, and following vendor's recommendation [1] it will not be returned for volumes that have snapshots. SysAdmins can force all volumes to return discard capabilities for Nova with the ``report_discard_supported`` configuration option. [1]: https://docs.delltechnologies.com/bundle/READY_NODE_AMS_DG/page/GUID-8E6676C1-425A-4D51-8F59-1A92DE4F6638.html Change-Id: Ib119fd689545bdb636a4844c6125aec7c3c24b96
14 lines
498 B
YAML
14 lines
498 B
YAML
---
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features:
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Dell EMC PowerStore driver: Report trimming/discard support to Nova and
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Cinder.
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Dell EMC PowerMax driver: Report trimming/discard support to Nova and
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Cinder.
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Dell EMC PowerFlex driver: Report trimming/discard support to Nova and
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Cinder on thin volumes that don't have snapshots. Not doing trim on
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volumes with snapshots is the vendor's recommendation, but can be overriden
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with the ``report_discard_supported`` configuration option.
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