HP StorageWorks User Manual

62 External Storage XP for the XP12000/XP10000
External LU’s extended identifying information. This information is used for identifying logical volumes
in the EVA disk array. For more information, see ”Identifying logical volumes of EVA disk arrays (using
Characteristic 2)” on page 111.
• ExG (1-16384)
Group number of the connected external LUs. You can specify any decimal value from 1 to 16384. The
E displayed outside the text box is the capital letter of the external LU group.
• Emulation Type
Emulation type of the mapped external LU (from the XP12000/XP10000 perspective).
If you clear the Except OPEN-V check box, OPEN-V and available mainframe emulation types appear
in the list.
If you select the Except OPEN-V check box, open-system emulation types other than OPEN-V appear in
the list. To map the external LU as an open-system volume, define the emulation type to use for the
mapped LU as OPEN-V or another type. To map the external LU as an open-system volume using an
emulation type other than OPEN-V, select the Except OPEN-V check box.
If you plan to use the mapped external LU for a Flex Copy XP pair, you must select OPEN-V.
When the external LU to be mapped has the VMA setting, you must select OPEN-V.
• LDEV Capacity
Default capacity of the emulation type selected in the Emulation Type box. When the external LU’s
capacity is larger than the capacity displayed in LDEV Capacity, the external LU is divided into the
displayed capacity, and multiple LDEVs are created.
• LDEV
Number of LDEVs created at mapping. By default, the maximum number of LDEVs corresponding to the
capacity supported by the emulation type specified in the Emulation Type box appears. When the
external LU to be mapped has the VMA setting, only 1 can be selected.
• IO Suppression
Mapped external LU’s IO Suppression mode (for OPEN-V emulation only) (see ”External LU attributes
set by mapping” on page 20).
To suppress I/O operations from hosts (by way of the XP12000/XP10000) to the mapped external LU
or use the mapped external LU for a Flex Copy pair, select Enable.
If you do not want to suppress I/O from hosts to the mapped external LU, select Disable (for example,
for use with External Storage XP).
If you set the emulation type to something other than OPEN-V, IO Suppression mode is automatically set
to Disable.
When the external LU to be mapped has the VMA setting, IO Suppression mode is automatically set to
Disable.
CAUTION: To use the mapped external LU for the software products other than Flex Copy XP (such
as Cache LUN XP, Auto LUN XP, Continuous Access XP, Continuous Access XP Journal Business
Copy XP, or Snapshot XP), set IO Suppression mode to Disable.
CAUTION: To set IO Suppression mode to Disable, External Storage XP must be installed.
CAUTION: To set IO Suppression mode to Enable, Flex Copy must be installed.
• Cache Mode
Specifies if the write I/O from the host is propagated synchronously or asynchronously to the external
storage device (see ”External LU attributes set by mapping” on page 20).
To propagate write I/Os from the host to the external disk array asynchronously, select Enable.
To propagate write I/Os from the host to the external disk array synchronously, select Disable.

HP StorageWorks Specifications

General

Brand	HP
Model	StorageWorks
Category	Storage
Language	English