HP 8/40 Fabric OS Encryption Administrator's Guide v6.4.0 (53-1001864-01, June - Page 140
LUN re-balancing when hosting both disk and tape, When adding a new disk or tape target container.
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3 CryptoTarget container configuration LUN re-balancing when hosting both disk and tape If you are currently using encryption and running Fabric OS version 6.3.x or earlier, you are hosting tape and disk target containers on different encryption switches or blades. Beginning with Fabric OS version 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 may 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 version 6.4.0 or a later release 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. If tape backup or restore jobs are in progress, quiesce the host I/Os for the disk LUNs for which rekey or first time encryption needs to performed before rebalancing. During re-balancing operations, be aware of the following: • You may notice a slight disruption in Disk I/O. In some cases, manual intervention may be needed. • Backup jobs to tapes may need to be restarted after re-balancing completes. To determine if re-balancing is recommended for an encryption engine, check the encryption engine properties. Beginning with Fabric OS version 6.4, a field is added that indicates whether or not re-balancing is recommended. You may be prompted to rebalance 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 taken place. To rebalance an encryption engine, do the following. 1. Log into the switch as Admin or SecurityAdmin. 2. Issue the cryptocfg - -show - -localEE command. 3. Look for Rebalanced recommended under EE Attributes in the output. If rebalancing is recommended, issue the cryptocfg - -rebalance command. If the encryption node is a blade, include the blade's slot number (cryptocfg - -rebalance ). 122 Fabric OS Encryption Administrator's Guide 53-1001864-01