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What If the link interruption occurs while Asynchronous Mirroring process is active

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e-series-systems
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esg
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Applies to

  • E-Series
  • Asynchronous Remote Volume Mirroring (ARVM)
  • Asynchronous Mirroring Group (AMG)

Answer

The network between two storage systems configured with a mirror relationship can experience intermittent interruptions:

  • If a link interruption occurs while mirror synchronization activity is idle, the link interruption is transparent to the mirror configuration.
  • If the link interruption occurs while some synchronization process is active (initial synchronization, manual synchronization, or periodic resynchronization), then inter-controller link interruptions cause the Primary controller to experience a temporary loss of communication with the secondary controller.
    • The AMG  Activity state transitions to  Paused .
      • As long as the Secondary volume is unavailable to the Primary during the synchronization process the Primary storage system raises a needs-attention condition to alert the storage administrator of the inter-controller connection disruption.
    • After losing access to the Secondary, the Primary controller periodically attempts to re-establish a connection with the Secondary.
    • When the Secondary controller becomes accessible again, the Primary continues synchronizing.

Note:

  1. AMG synchronization is not complete until all volumes of the AMG complete the synchronization process.
  2. If the mirror synchronization process extends beyond the synchronization interval warning threshold or the recovery point threshold due to the controller reboot, then those user alerts are triggered.
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