NetBackup status code: 1557
Message: Must specify mirror retention when target storage unit is mirror capable.
Explanation: You have specified a target storage unit that is mirror-capable for a replication operation in a storage lifecycle policy, but the retention is not mirror type.
Recommended Action: If you used a nbstl command to configure the storage lifecycle policy, rerun the command after the following: Specify the mirror retention type for the replication operation corresponding to the storage unit that is mirror-capable. Use the bpstulist -U command to view the storage unit properties. If the error occurs when you configure the storage lifecycle policy by using the GUI, submit a problem report and provide the appropriate logs.
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