Managing HP X9000 Network Storage System Remote Replication Application Note (TA768-96049, November 2011)

Network failures
This case assumes that the source file serving nodes communicate with the target file serving nodes
over the user network, and the source file serving nodes communicate locally with each other over
the cluster network. If a source file serving node loses both the cluster and user networks, the node
will fail over to its HA backup node, which will take over its segments and responsibilities. Complete
the steps in “Failed source file serving node” (page 17).
If the source cluster network drops for a source file serving node, that node's replication queue is
emptied and no new changes will come in. The software will retry the connection for a period of
time and then stop. Once network problems are resolved and the server rejoins the cluster, the
replication task is restarted automatically and replication resumes. Because the replication software
can access the target cluster throughout, no errors occur and the software is not aware that the
cluster network is down unless it is using it for replication. If the user network drops, remote
replication retries for a period of time and then stops. When the network problem is resolved, stop
the replication task and then restart it manually.
Failed target file serving node
If remote replication cannot reach a target file serving node, it will try another target node. If the
software cannot find a target node, it retries for a period of time and then stops. Once the network
problem has been resolved, stop the replication task and then restart it, which involves a
resynchronization of the source and target.
18 Using remote replication