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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Transient fault operations

In Cascaded SRDF/Star, the loss of either target site does not interrupt production. However, the loss of the synchronous site can result in the loss of remote replication capability (unless SRDF/Star is reconfigured to run in Concurrent SRDF/Star).

Loss of the synchronous target means that Cascaded SRDF/Star is not performing replication.

If the outage is expected to be brief, you can continue production at the workload site without remote replication. When the outage is restored, you can then reset the synchronous target.

The following image shows the transient fault operations that are available from each state after the loss of the asynchronous target site.

NOTE:

This diagram assumes that the synchronous target stayed protected during the fault.

Figure 1. Cascaded SRDF/Star: transient fault operations (asynchronous loss)
  • The reset operation transitions the state from PathFail to Disconnected after a transient fault from the loss of the asynchronous target site.
  • The cleanup operation (if required) performs MSC cleanup at the target site and transitions the state from PathFail;CleanReq to PathFail.

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