Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Restrictions

Use the -restore option to copy data back to the R1 source devices.

• All devices in the group must be specified for the operation. The group must be empty prior to the createpair -metro -restore operation.
• Include -metro option to create devices.
• If the Device Bias method determines which side remains accessible to the host in the event of a link or other failure, include the -use_bias option.
• The operation creates the device pairs and makes them RW on the link. When the createpair operation completes, the device pair's mode is Active and their pair state is SyncInProg.
• The pair state is SyncInProg until there are no invalids and the R2 side has acquired the R1 device information. Then the pair state transitions to ActiveActive or ActiveBias.

Once the SRDF device pairs are created, the restore operation begins copying data to the source devices, synchronizing the dynamic SRDF device pairs listed in the device file.

• Both the R1-side and R2-side arrays must be running HYPERMAX OS 5977.691.684 or later.
• If GCM is set on a device which is R1 in the SRDF/Metro configuration and the createpair completed the restore or the invalidate R1 parameter, then the R1 (when mapped) must be USER NOT READY. At the completion of the createpair command the USER NOT READY indication is cleared.

Example - Create SRDF/Metro pairs (Array Witness)

To create SRDF/Metro device pairs using device file device_file:

symrdf –f /tmp/device_file –sid 085 -type r1 –rdfg 86 createpair
      –restore -metro 

Example - Create SRDF/Metro pairs (Device Bias)

To create SRDF/Metro device pairs using device file device_file and specify the bias method:

 symrdf -f /tmp/device_file -sid 085 -rdfg 86 createpair -restore -metro -use_bias