(This is a continuation of the previous reply)

Disaster recovery practices for site disasters include failing over to use storage and systems at a remote site and/or recovery of backed up data.

Dual component failures are rare, but can occur. When that happens, the storage array and any volumes with data stored on them go offline and are unavailable for I/O operations. Data in cache memory will be retained by cache batteries, which are rated for 72 hours. When failed components have been replaced, the array is restarted and volumes with data on it are brought back online. Volumes that span arrays do not require special operator actions, they will be brought back online following the completion of internal consistency checks. If replication is being used, failover procedures can be used to continue operations until remedies have been made to the failed array.

Software bugs are rare, but can occur. Customers should always contact technical support for assistance in such cases to determine the best course of action.

EqualLogic systems have been designed to make it difficult for “pilot error” to cause a system failure. Operator errors in conjunction with one of the other three failure modes have the most potential to complicate recovery operations. The best approach is to contact technical support when it is not clear what course of action to take. Unlike many systems, shutting down and restarting an array to see if a problem will automatically be resolved is not necessarily a good practice.

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