HP XP Array Manager Software - Manual (Page 17)

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Do not apply or refer to Cache Residency settings to volumes from the host and Remote Web
Console computer at the same time, though you can apply the settings from the host if you
use Cache Manager.
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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.
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If you use Cache Residency Manager to set the bind mode, while the mode setting of the
battery backup system is de-staging, you run a risk that should the electric power be shut off,
battery power may also run out before the de-staging processing is completed. To avoid this
risk, do not set the bind mode if the mode setting of the battery backup system is de-staging.
Contact your system manager for information about the current mode setting of the battery
backup system.
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You cannot allocate Pool-VOLs and V-VOLs for Cache Residency Manager. For further
information about Pool-VOLs and V-VOLs, see the HP StorageWorks XP24000/XP20000
Snapshot User Guide and the HP StorageWorks XP24000/XP20000 Thin Provisioning Software
User Guide.
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You cannot allocate the journal volumes for Cache Residency Manager.
Note: For additional information about the journal volumes, see the HP StorageWorks
XP24000/XP20000 Continuous Access Journal Software User and Reference Guide or the
Hitachi Universal Replicator™ for Mainframe User Guide: HP XP24000/XP20000 Disk Array.
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You cannot allocate the remote command device for Cache Residency Manager.
Note: For further information about the remote command device, see the HP StorageWorks
XP24000/XP20000 External Storage Software User Guide.
Figure 3 Example of LBA Value Setting When Using LUSE
To set Cache Residency for a LUSE volume, you must set Cache Residency for an LDEV that is a
component of the LUSE volume. To determine the LDEV for which you want to set Cache Residency,
you must know the exact number of LBAs in each LDEV that is a component of the LUSE volume.
Note: The number of LBAs displayed in the Cache Residency window is different from the actual
number of LDEVs, and does not match the number of LBAs recognized by the host.
Cache Residency Manager Restrictions 17