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Dell PowerFlex 4.6.x Technical Overview

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Protected maintenance mode

Protected maintenance mode is anther type of maintenance mode that ensures no data loss during down time.

Protected maintenance mode is another type of maintenance state where a third copy is created. If there should be a node failure during instant maintenance mode, then there is no SDS up to serve I/Os for the data. With protected maintenance mode, a third copy is created before maintenance mode, which ensures that if there is a node failure where the second copy of SDS is required, there is still a full backup of the SDS.

Auto abort

Protected maintenance mode consumes a significant amount of capacity. In some cases, this capacity may be required for more important tasks such as user I/O or rebuild.

The purpose of this capability is to cancel protected maintenance mode when approaching the end of capacity, to avoid impacting I/O or rebuild. For example, if a single node is entering protected maintenance mode and a third copy is being created, then a second node fails. Auto abort will confirm that the third copy space is made available to perform a rebuild.

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