HP XP Array Manager Software - Manual (Page 9)

Pre-staging occurs under any of the following circumstances:
•
When pre-staging is performed from the SVP or from Remote Web Console.
•
When the power is turned on.
•
When cache maintenance is performed.
Notes:
•
If you have accessed the Cache Residency area for input and output before the pre-staging
operation is performed from the SVP or Remote Web Console, the host may not be able to
find data in the cache at the first I/O access after Cache Residency is configured.
•
In order to prevent slow host I/O response time, the pre-staging operation may be interrupted
when the cache load is heavy.
•
If you specify the Cache Residency Manager setting on the volume during the quick formatting,
do not use the pre-staging function. If you want to use the pre-staging function after the quick
formatting processing completes, first you need to release the setting and then specify the
Cache Residency Manager setting again, with the pre-staging setting enabled this time. For
information about the quick formatting, see HP StorageWorks XP24000/XP20000 Virtual
LVI/LUN (VLL) and Volume Shredder User Guide.
•
When external volumes are set in the storage system, execute the Disconnect Subsystem
command on the external storage system before turning off the power supply of the storage
system. If you turn off the power supply without executing the Disconnect Subsystem
command and then turn on the power supply again, the pre-staging processing is aborted. If
the pre-staging processing is aborted, perform the pre-staging operation from the SVP or
Remote Web Console.
•
The prestaging processing is aborted if a volume is created, deleted or restored during the
performing of prestaging. If the prestaging processing is aborted, perform the prestaging
operation from the SVP or Remote Web Console after finishing a volume when creating,
deleting or restoring.
Using Pre-staging for Immediate Data Access in Priority and Bind Modes 9