## Managing Key Change Operations in Cisco DCNM for DKR

The following are the two key change operations:

• No data preparation—Any local key changes result in DKR suspending host access to the remote disk. Once the local key change is verified for data integrity and the data replication to the remote end is synchronized, the administrator can select the required relationship and perform the synchronization operation in DKR. This operation synchronizes the source and destination keys and resumes the host access to the remote disk.

• Data preparation—Ensure that you complete the following before starting the data preparation on the source disk:

– Disable DKR relationship.

– Disable the replication between source and destination disk. This is a disk array vendor-specific operation.

Once data preparation is complete and verified for data integrity, perform the following:

– Enable the data replication between the source and destination using the disk array vendor-specific operation.

– Once data is synchronized between the source and destination disk, enable the DKR relationship. This operation synchronizes the source and destination keys.

Caution Stop accessing the host on the destination disk until the data preparation is complete. Accessing the host during data preparation results in data loss.