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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Sample session: planned failover

This section is an example of a planned failover of the cascaded SRDF configuration depicted in title 36:

Figure 1. Cascaded configuration before planned failover

For the example session:

  • Commands are issued from a control host connected to SID 198.
  • Commands are issued to an SRDF device group.
  1. Use the symcfg list command to verify that both array 321 and 256 are visible to the control host.
  2. Use the symrdf -gGroupName query -hop2 command to verify that the RDF Pair State for devices in the SID 321 -> SID 256 hop are Synchronized.

    The SID 321 -> SID 258 hop is synchronous. Healthy device pairs are "Synchronized".

  3. Use the symrdf -g GroupNamequery -rdfa command to verify that the RDF Pair State for devices in the SID 256 -> SID 198 hop are Consistent.

    The SID 256 -> SID 198 hop is asynchronous. Healthy device pairs are "Consistent".

  4. Use the symrdf -g GroupName suspend -hop2 command to suspend the device pairs of the SID 321 -> SID 256 hop.
  5. Use the symrdf -g GroupName query -hop2 command to verify that the RDF Pair State for devices in the SID 321 -> SID 256 hop is Suspended.
  6. Use the symrdf -g GroupName suspend -force command to suspend the device pairs of the SID 256 -> SID 198 hop.
  7. Use the symrdf -g GroupName query command to verify that the RDF Pair State for devices in the SID 256 -> SID 198 hop is Suspended.
  8. Use the symrdf -g GroupName failover -hop2 command to failover from SID 321 to SID 256.
  9. Use the symrdf -g GroupName failover -force command to failover from SID 256 to the SID 198.
  10. Use the symrdf -g GroupName query -hop2 command to verify that the RDF Pair State for devices in the SID 321 -> SID 256 hop are Failed Over.
  11. Use the symrdf -g GroupName query command to verify that the RDF Pair State for devices in the SID 256 -> SID 198 hop are Failed Over.
  12. Use the symrdf -g GroupName set mode acp_disk -hop2 command to change the SRDF mode between SID 321 and SID 256 to adaptive copy disk mode.
  13. Use the symrdf -g GroupName swap -hop2 command to swap personalities between SID 321 and SID 256.

    The configuration is now:

    Figure 2. Planned failover - after first swap
  14. Use the symrdf -g GroupName swap command to swap personalities between SID 256 and SID 198.

    The configuration is now:

    Figure 3. Planned failover - after second swap
  15. Use the symrdf -g GroupName resume -hop2 command to resume the device pairs of the SID 256 -> SID 321 hop.
  16. Use the symrdf -g GroupName resume -force command to resume the device pairs of the SID 198 -> SID 256 hop.
    NOTE:

    Do not change the SRDF mode from SID 256 -> SID 321. The R1 -> R21 hop is now Asynchronous. Only adaptive copy disk mode is supported for the R21 -> R2 hop.

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