Skip to main content
NetApp Knowledge Base

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

Last Updated:

Applies to

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


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.


  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.
NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.