Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Recover from a transient fault without reconfiguration: concurrent SRDF/Star

1. Issue the symstar -cg CgName reset command to clean up any internal metadata or cache remaining at the asynchronous site after the transient fault occurred.

   To cleanup cache and metadata for CG StarGrp at site London:

   symstar -cg StarGrp reset -site London
   

   NOTE:

   If remote BCVs are configured, split the remote BCVs after a transient fault to maintain a consistent image of the data at the remote site until it is safe to reestablish the BCVs with the R2 devices. Resynchronization temporarily compromises the consistency of the R2 data until the resynchronization is fully completed. The split BCVs retain a consistent restartable image of the data volumes during periods of SRDF/Star resynchronization.

   The next step varies depending on whether SRDF/Star data at the remote site are protected with TimeFinder BCVs:

   • If SRDF/Star data at the remote site are protected with TimeFinder BCVs, proceed to Step 2.
   • If not, skip to Step 3.
2. If SRDF/Star data at the remote site are protected with TimeFinder BCVs, perform the appropriate TimeFinder actions.

   To split off a consistent restartable image of the data volumes prior to resynchronization at the asynchronous target (London) site:

   symmir -cg StarGrp split -star -rdf -rdfg name:London
   

3. Issue the symstar -cg CgName command with the connect, protect, and enable options to return the asynchronous site to the SRDF/Star configuration.

   To connect, protect and enable the CG StarGrp at site London:

   symstar -cg StarGrp connect -site London
   symstar -cg StarGrp protect -site London
   symstar -cg StarGrp enable
   

4. If any London BCV pairs are part of the composite group, issue the symmir -cg CgName establish command to reestablish them.

   To reestablish the BCV pairs:

   symmir -cg StarGrp establish -star -rdf -rdfg name:London