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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Removing device pairs from SRDF/Metro using -keep

Using the -keep option with either the deletepair or movepair operation on arrays running HYPERMAX OS 5977 and PowerMaxOS 5978, device pairs can be removed when:
  • the devices in the session are RW on the SRDF link, or
  • the current R2 side should remain host-accessible and the current R1 side should be host-inaccessible after removal from the session.

Only one side of the RDF device pairs that are removed from the SRDF/Metro session will remain host-accessible when the operation completes. To specify the side that should remain host-accessible, use the -keep R1 or -keep R2 option.

NOTE: In all cases, only the side specified with -keep remains host-accessible. It retains the device ID that was being used when it was part of the SRDF/Metro session (this would be the ID of the original R1 side). If the devices are configured with Compatibility ID, the losing side will have the ID of the original R2 side when the device pair was first put into the SRDF/Metro session. If the devices are configured with Mobility ID, the losing side will be assigned a new Mobility ID.
NOTE:When using movepair, it leaves devices in Synchronous mode and Suspended in the new group.

Examples

In the following example, the deletepair command:
  • removes the RDF device pairs described in file /tmp/device_file and then deletes the RDF pairings.
  • uses the -keep option because the devices are RW on the RDF link. The -keep R1 indicates that the current R1-side devices should remain host-accessible after the deletepair operation. 
symrdf deletepair -sid 123 -rdfg 3 -f /tmp/device_file keep R1
In the following example, the movepair command:
  • moves the RDF device pairs described in file /tmp/device_file out of the SRDF/Metro session into RDF group 10 on array 123.
  • uses the -keep option because the devices are RW on the RDF link.The -keep R2 indicates that the current R2-side devices should remain host-accessible after the movepair operation. 
symrdf movepair  -sid 123  -rdfg 3  -f /tmp/device_file movepair -new_rdfg 10 -keep R2

After completing the movepair operation, the devices that were previously identified as R2 will remain host-accessible and will be identified as R1 and the devices that were previously identified as R1 will be host-inaccessible and will be identified as R2.

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