HP Brocade 8/12c Fabric OS Encryption Administrator's Guide - Page 97
Re-balancing the encryption engine
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Re-balancing the encryption engine 2 Re-balancing the encryption engine If you are currently using encryption and running Fabric OS 6.3.x or earlier, you are hosting tape and disk target containers on different encryption switches or blades. Beginning with Fabric OS 6.4, disk and tape target containers can be hosted on the same switch or blade. Hosting both disk and tape target containers on the same switch or blade might result in a drop in throughput, but it can reduce cost by reducing the number of switches or blades needed to support encrypted I/O in environments that use both disk and tape. The throughput drop can be mitigated by re-balancing the tape and disk target containers across the encryption engine. This ensures that the tape and disk target containers are distributed within the encryption engine for maximum throughput. All nodes within an encryption group must be upgraded to Fabric OS 6.4 or later to support hosting disk and tape target containers on the same encryption engine. If any node within an encryption group is running an earlier release, disk and tape containers must continue to be hosted on separate encryption engines. During re-balancing operations, be aware of the following: • You might notice a slight disruption in Disk I/O. In some cases, manual intervention may be needed. • Backup jobs to tapes might need to be restarted after re-balancing is completed. To determine if re-balancing is recommended for an encryption engine, check the encryption engine properties. Beginning with Fabric OS 6.4, a field is added that indicates whether or not re-balancing is recommended. You might be prompted to re-balance during the following operations: • When adding a new disk or tape target container. • When removing an existing disk or tape target container. • After failover to a backup encryption engine in an HA cluster. • After a failed encryption engine in an HA cluster is recovered, and failback processing has occurred. To re-balance an encryption engine, complete the following steps: 1. Select Configure > Encryption from the menu task bar. The Encryption Center dialog box displays. 2. Select an engine, then select Engine > Re-Balance from the menu task bar, or right click an engine and select Re-Balance. A warning message displays, noting the potential disruption of disk and tape I/O, and that the operation may take several minutes. 3. Click Yes to begin re-balancing. Fabric OS Encryption Administrator's Guide 77 53-1002159-03