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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Create pairs with the -establish option

Restrictions

  • All devices in the group must be specified for the operation. That is, the group must be empty prior to the createpair -metro -establish operation.
  • The -metro option must be specified.
  • If the Device Bias method of determining which side of the device pair remains accessible to the host is used, include the -use_bias option.
  • For configurations that use the Array Witness bias method, the Witness SRDF groups must be online.
  • For configurations that use the vWitness bias method, both arrays must be connected to the same vWitness instance and that instance must be active.
  • 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 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.
  • SRDF device pairs cannot be created in an SRDF Witness group
  • Both the R1-side and R2-side arrays must be running HYPERMAX OS 5977.691.684 or later.
  • The createpair -establish -metro requires that the specified RDF group be empty.

Example - Create SRDF/Metro pairs (Array Witness and vWitness)

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

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

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