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HP StorageWorks XP24000 User Manual: Cache Residency Manager; Volume Security; Volume Retention Manager; Xp Auto Lun

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Cache Residency Manager

Cache Residency Manager for Mainframe volumes can be assigned to SIz pairs, and Cache
Residency Manager for Mainframe operations can be performed on existing SIz S-VOLs and
T-VOLs.
CAUTION:
quick restore operations on Cache Residency Manager for Mainframe volumes.
CAUTION:
The performance in the V-Split or SP-Pend state is different depending on the value of the system
option mode 459 (ON or OFF, OFF by default) and whether the T-VOL or the volume in a pool
that is associated with the T-VOL is an external volume or an internal volume.
Table 5 The performance in the state of V-Split or SP-Pend is different depending on the value of
the system option mode 459 and the type of T-VOL.
System option mode 459
OFF
ON

Volume Security

Volume Security operations do not directly affect SIz operations. Secure LDEVs can be assigned
to SIz pairs, and SIz volumes can be secured. A secure LDEV will accept SIz initial and update
copy operations. However, you cannot specify volumes that are selected as invalid T-VOLs for SIz
T-VOLs. When an S-VOL is secured by Volume Security, this setting does not apply to the
corresponding T-VOLs.
SIz T-VOLs cannot be accessed by any host except when the pair is split.

Volume Retention Manager

Normal volumes have the read/write attribute so that you can access and update the data without
any restrictions. By using Volume Retention Manager, you may set the read only attribute, which
prohibit writing operation, or the protect attribute which prohibit both reading and writing
operations. Remember that you cannot create SIz pairs with the volumes with protect attribute.

XP Auto LUN

SIz volumes can be assigned to migration volumes of XP Auto LUN. However, if the SIz S-VOL is
already paired with three T-VOLs, you must delete the SIz pairs before migrating the volumes by
XP Auto LUN. Also, to assign SIz volumes to destination volumes of migration by XP Auto LUN, or
reserve SIz volumes for XP Auto LUN, you must delete the SIz volumes or un-reserve SIz volumes
before using the volumes by XP Auto LUN. If you assign an SIz S-VOL that is already paired with
three T-VOLs to migration volumes of XP Auto LUN, or assign SIz volumes to other XP Auto LUN
volumes than migration volumes, the command will be rejected.
Also, if you split the SIz pair that is assigned to XP Auto LUN's migration volumes, migration of
those volumes will be canceled.
See
"Suspend Pair Operation" (page 15)
See
"Performance Considerations" (page 48)
S-VOL*
Internal volume
External volume
Internal volume
External volume
for important information on performing
for the change of pair status to Split.
PSUS(SP) or COPY(SP)
The pair status changes to Split after all
the differential data are copied to the
cache in the storage system.
The pair status changes to Split after all
the differential data are copied to the
cache in the storage system and
completed the destage in the external
storage system.
Cache Residency Manager
29

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