HP StorageWorks XP Remote Web Console Software User Manual
Page 42
To optionally initialize the LU's data area, use Volume Manager to format the LU. For instructions,
see the HP StorageWorks XP LUN Configuration and Security Manager user guide: HP XP12000
Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System.
•
If you set a mainframe-system emulation type (such as 3390-3) when mapping the external LU,
format the LU or perform the Write to Control Blocks operation to make the volume usable.
After the mapping operation, the mapped LU's status is Blockade. Use Volume Manager to format
the volume or perform the Write to Control Blocks operation to make the volume usable.
• If you mapped a volume that has already been zero-formatted on the external array side,
perform the Write to Control Blocks operation.
• If you mapped a volume that has not been zero-formatted on the external array side, format
the volume on the local array side.
For instructions on the formatting and Write to Control Blocks operations, see the HP StorageWorks
XP LUN Configuration and Security Manager user guide: HP XP12000 Disk Array, HP XP10000
Disk Array, HP 200 Storage Virtualization System.
If you format the external array's mapped LU from the external array side, data that existed prior
to formatting cannot be ensured. When using the mapped external LU from the mainframe OS,
format the mapped volume from the local array side.
•
IO Suppression mode is set when the LU is mapped and it cannot be changed while the LU is
mapped. To change IO Suppression mode, delete the external LU mapping (Delete LU operation),
and remap the LU with different attributes (Add LU operation).
•
External LU attributes for all LDEVs created in an external LU are set to the same values. Those at-
tributes are modified when the LDEVs are reconfigured using Volume Manager.
•
Mapped volumes that have different external volume attributes (IO Suppression mode, Cache
Mode) cannot be used to create one LUSE volume.
•
A mapped external LU with IO Suppression mode set to Enable (such as for XP Flex Copy) cannot
be used for the local array's XP Cache LUN operations.
•
For a external LU with IO Suppression mode set to Disable (such as for XP External Storage), XP
Cache LUN's Bind mode is not available.
•
If you use the mapped external LU for XP Cache LUN operations and set the bind mode, XP Cache
LUN operations require a cache of twice the capacity of the user data.
•
For XP External Storage, IO Suppression mode is typically set to Disable. You cannot use a mapped
external LU with IO Suppression mode set to Enable for pair copy operations in XP Continuous
Access, Hitachi TrueCopy™ for z/OS, XP Continuous Access Journal, Hitachi Universal Replicator™
for z/OS, XP Business Copy, Hitachi ShadowImage™ for z/OS, or XP Snapshot. Also, the external
LU cannot be used for automatic XP Auto LUN operations.
•
Attributes originally set for an external LU on the external array side (such as port security, HP
StorageWorks XP Secure Manager, and Volume Retention Manager attributes) are not kept when
the external LU is mapped as a local array internal LDEV. To keep the original attributes, set those
attributes on the mapped external LU from the local array side.
•
If you map an external LU for which the VMA of Data Retention Utility is set, you need to configure
system options before performing the Discovery operation to enable the VMA information. Call
HP technical support to ask about how to configure system options.
•
If you mapped the external LU and previously set the VMA of Data Retention Utility in that volume,
the former VMA setting is superseded when you map the volume again. However, if Data Retention
Utility is not installed when you remap the volume, the volume with the VMA setting cannot be
mapped. To change the VMA setting, change it from the local array side.
•
Do not combine LDEVs of multiple external volumes to create a LUSE volume. The LDEVs in the
same external volume can only be used to set the LUSE volumes. When you combine LDEVs of
multiple external volumes to create a LUSE volume, you need to consider:
Preparing for XP External Storage operations
42