Dell EMC Metro node 7.1 Administrator Guide

Resuming I/O at the losing cluster

During an inter-cluster link outage, you might permit I/O to resume at one of the two clusters, the winning cluster.

1. Use the ls command to display the operational status of the target consistency group.

   VPlexcli:/clusters/cluster-1/consistency-groups/cg1> ls
   Attributes:
   Name                 Value
   -------------------  ----------------------------------------------------------
   active-clusters      [cluster-1, cluster-2]
   cache-mode           synchronous
   detach-rule          no-automatic-winner
   operational-status   [(cluster-1,{ summary:: ok, details:: [] }),
                         (cluster-2,{ summary:: suspended, details:: [requires-resume-at-loser] })]
   passive-clusters     []
   recoverpoint-enabled false
   storage-at-clusters  [cluster-1, cluster-2]
   virtual-volumes      [dd1_vol, dd2_vol]
   visibility           [cluster-1, cluster-2]
   Contexts:
   advanced  recoverpoint

2. Use the consistency-group resume-at-loser to restart I/O on the losing cluster.

   VPlexcli:/clusters/cluster-1/consistency-groups/cg1> resume-at-loser -c cluster-2
   This may change the view of data presented to applications at cluster cluster-2. You should first stop applications at that cluster. Continue? (Yes/No) Yes

3. Use the ls command to verify the change in operational status:

   VPlexcli:/clusters/cluster-1/consistency-groups/cg1> ls
   Attributes:
   Name                 Value
   -------------------  ----------------------------------------------------------
   active-clusters      [cluster-1, cluster-2]
   cache-mode           synchronous
   detach-rule          no-automatic-winner
   operational-status   [(cluster-1,{ summary:: ok, details:: [] }),
                         (cluster-2,{ summary:: ok, details:: [] })]
   passive-clusters     []
   recoverpoint-enabled false
   storage-at-clusters  [cluster-1, cluster-2]
   virtual-volumes      [dd1_vol, dd2_vol]
   visibility           [cluster-1, cluster-2]
   Contexts:
   advanced  recoverpoint

   You might notice rebuilding-across-clusters in operational status while devices are rebuilding.