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GEOMETRY COMPATIBILITY MODE (GCM)
During NDM, “user defined” geometry is set on all devices within the SG.To allow the expansion of target devices post migration we will
require the geometry to be set to “Native”. This will require Solutions Enabler 8.4 and is user configurable at this level.
In the case where the device being migrated was an odd cylinder count the GCM flag will also be set. This flag is not currently user
configurable. Expansion of such devices will require the LUN to be taken offline and adjusted by contacting Dell EMC support. This is to
be rectified in the next Hypermax OS release and will be user adjustable as long as the LUN is not in a replication session.
USE THE RECOVER COMMAND
The recover command can be used if a migration step fails due to some problem in the environment, such as a connectivity issue
between the source and target arrays or the failure of a command to complete that leaves an NDM operation only partially finished.
In this example, a commit failed because of a transient issue on the target array. The transient issue resolved itself and a recover
operation was immediately run. The recover operation picks up where the command failed and completes the commit operation.
To run the recover, click the double angle brackets and click Recover.
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