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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Create pairs with the -format option

Use the -format option to add unmapped or NR device pairs to an SRDF/Metro group that is RW on the SRDF link. SRDF/Metro clears all the tracks on the new devices as it adds them to the group. Once added, the devices are RW on the SRDF link but are inaccessible to the host until they are fully protected by SRDF/Metro and are in the ActiveActive or ActiveBias state.

You can also use the -format option to add device pairs to a group that is NR on the SRDF link. In this case, the newly added devices are also NR on the SRDF link. In addition, the R1 devices are accessible to the host after formatting completes.

Restrictions

  • Both arrays in the SRDF/Metro configuration must run HYPERMAX OS 5977 Q3 2016 SR or later.
  • The -format option cannot be used to add devices into an empty SRDF group.
  • The new devices must be unmapped or NR.
  • The SRDF type cannot be specified as a part of the createpair operation. The new RDF pair matches the polarity of the existing devices in the SRDF/Metro configuration.
  • The bias cannot be changed until all the devices in the SRDF/Metro configuration are RW on the link and have reached an ActiveBias SRDF pair state.
  • The newly added R1 devices are accessible to the host immediately, even if the active SRDF/Metro session drops before the newly added devices are synchronized.
  • When using the -format option to add devices to an SRDF/Metro configuration, you cannot use the following createpair options:
    • -use_bias
    • -establish
    • -invalidate
    • -type
    • -restore

Example 

symrdf createpair -sid 55 -file devicefile -rdfg 1 -format -metro

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