HP StorageWorks P9000 Application Performance Extender Software 2.1 Release Notes (5697-0803, January 2011)

Enhancements
P9000 Application Performance Extender v2.1 includes the following enhancements:
• Introduces the DLOM (Dynamic LDEV Ownership Management) feature. This feature enhances the
array performance by balancing MP blade utilization.
• License enforcement for P9500 disk arrays. Supports Meter based Term licenses for P9500 disk
arrays.
• Introduces the Watch dog feature to monitor the P9000 Application Performance Extender controller.
In case of a controller failure, the watch dog will reset the QoS settings of the array to the default
settings.
• For large configurations (hosts that have more than 25 LDEVs), configuration collection happens
in parallel.
• Robust error handling and reporting mechanism for the controller's communication interface.
Notes
• A host can be connected to only one P9500, XP24000, or XP20000 array.
• A maximum of four XP or P9500 disk arrays only is supported per management station.
• P9000 Application Performance Extender supports one controller per XP or P9500 disk array.
For multiple XP or P9500 disk arrays, multiple instances of the controller on different hosts accessing
each of the arrays are required.
• The IP address of the hosts should not be changed after installation.
• If the management station is down for a certain duration, the controller works with the set SLO
values, but performance data for that duration is not available.
• After a PRM group configuration change, configuration data must be collected again for that host.
• If a management station has been restarted, host discovery will take a while depending on the
number of hosts connected to the management station. For example, a set up with 32 hosts con-
nected to a single management station will take two to eight minutes.
• If you add or configure ports on XP arrays, or add new MP Blades in P9500 disk arrays, ensure
that you restart the controller.
• Perceptible workload differentiation may not be achieved with P9000 Application Performance
Extender in certain low or medium load conditions.
• For highly oscillating or random workload conditions, HP recommends that you set bandwidth
targets.
• You can hide offline hosts, but you cannot remove hosts that are registered with the management
station.
• If command devices are not accessible by the controller that is functioning, you must manually set
the command devices after restoring its availability. To set command devices, click Use Command
Devices on the Controller Settings screen.
• If the controller service is not stopped properly, XP and P9500 disk array performance may be
impacted.
• To view performance graphs for more than two workloads, ensure that you reset the sliders to
their original position.
• If you acquire a resource lock on a P9500 disk array, the Dynamic LDEV Ownership Management
(DLOM) feature will not be effective until the lock is released.
• The workload or MP blade performance data can grow only up to 1 GB each. Oldest Performance
data will be purged once that size is reached.
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