HP StorageWorks 2/16V HP StorageWorks Fabric OS 5.2.0b Release Notes (AA-RWEYB - Page 11

In addition, the following conditions must be met before upgrading to Fabric OS 5.2.0b: • Device-based routing must not be in use, otherwise the upgrade will fail. You can use the aptPolicy command to verify the routing policy. • Chassis configuration options 3 and 4 are no longer supported for the 4/256 SAN Director Additional notes on Fabric OS 5.2.0b firmware upgrade/downgrades include: • HP supports downgrading up to two previous releases, for example, if you upgrade to Fabric OS 5.2.0b from 5.0.x, you can revert back to 5.0.x. However, you cannot downgrade from Fabric OS 5.2.0b to 4.4.0 or to a previous release. NOTE: If the 4/256 SAN Director has FC4-48 blades installed or any new software features in Fabric OS 5.2.0a, such as FCR trunking, you cannot downgrade below Fabric OS 5.2.0a. If you wish to do so, you must a) remove these features, b) physically remove the blade, and then c) downgrade firmware. • For any other new software features or increased scalability limits supported by Fabric OS 5.2.0b, downgrade will be disruptive and requires cold reboot. • A Fabric OS 5.2.0b configuration file cannot be used on the same switch after the switch has been downgraded to firmware version 5.0.x or 5.1.x. • When you downgrade to Fabric OS 5.0.x, you will also need to remove additional 5.1.x features (and any installed B-Series MP Router blades). The firmwareDownload command will guide you to remove any features and blades that need to be removed. Fabric OS 5.2.0b 11