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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Restore for the DR session

About this task

A restore makes the devices in the DR session RW on the SRDF link and initiates an incremental re-synchronization of data from the DR array to the SRDF/Metro array. The SRDF/Metro state is Suspended in order to perform a restore -dr operation.

Figure 1. Restoring the DR session
A restore temporarily makes the MetroR1 inaccessible to the host while the symmdr restore command is running. Once the restore command completes successfully:
  • the MetroR1 is accessible to the host,
  • the DR is Write Disabled (WD) to the host,
  • the MetroR2 remains inaccessible to the host,
  • the Metro Service state remains Inactive.

When DR mode is async:

Once the restore command completes:
  • the DR Service state is Active
  • While the re-synchronization is ongoing the DR state is Consistent and copy direction is SRDF/Metro <– DR
  • Once the MetroR1 contains the same data as the DR the DR state is Consistent and copy direction is SRDF/Metro –> DR

When DR mode is Acp_disk

Once the restore command completes:
  • the DR Service state is Active
  • while the re-synchronization is ongoing the DR state is SyncInProg and copy direction is SRDF/Metro <– DR
  • Once the MetroR1 contains the same data as the DR, the DR state is Synchronized and copy direction is SRDF/Metro –> DR

Example

The following example shows the result of the symmdr –sid -702 –name metrodr1 restore –dr command on array 702 when the SRDF/Metro state is Suspended, the DR state is Split and DR mode is Asynchronous. 

symmdr –sid -702 –name metrodr1 restore –dr

A MetroDR DR 'Restore' operation is in progress
for 'metrodr1' Please wait...

    Update environment attributes..................................Started.
      MetroR1_ArrayID: 000197801702, Metro_RDFG  : 0115, DR_RDFG     : 0033
      MetroR2_ArrayID: 000197600056, Metro_RDFG  : 0119, DR_RDFG     : 0076
      DR_ArrayID     : 000197900048, MetroR1_RDFG: 0028, MetroR2_RDFG: 0044
      DR_Mode        : Adaptive Copy, MetroDR Devs: 6
    Update environment attributes..................................Not Needed.
    Start Data Repl (Host Access [MetroR1:Enable,DR:Disable])......Started.
    Start Data Repl (Host Access [MetroR1:Enable,DR:Disable])......Done.

The MetroDR DR 'Restore' operation successfully executed
for 'metrodr1'.

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