HP StorageWorks XP Remote Web Console Software - Manual (Page 47)

External Storage XP user guide 47
• Characteristic2
External volume’s extended identifying information. This information is used for identifying logical
volumes in the EVA disk array. For more information, see ” Description for Characteristic2” on page 86 .
• ExG (1-16384)
Group number of 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
The emulation type of the connected external LU (from the XP10000/XP12000 perspective). 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 LU using an emulation type other
than OPEN-V, select the Except OPEN-V check box. Other emulation types appear in the list. When the
external volume to be mapped has the VMA setting, only OPEN-V can be selected.
If you plan to use the mapped external LU as part of a Flex Copy pair, you must specify OPEN-V.
• LDEV Capacity
Default capacity of emulation type selected in the Emulation Type box. When capacity of the external
LU is larger than capacity displayed in LDEV Capacity, the external LU is divided into an appropriate
multiple of LDEVs equal to the size displayed.
• LDEV
Number of LDEVs created based on the capacity supported by the emulation type specified in the
Emulation Type box. When the external volume to be mapped has the VMA setting, only 1 can be
selected.
• IO Suppression
IO Suppression mode of mapped external LU (for OPEN-V emulation only). To suppress I/O operations
from hosts (by way of the XP10000/XP12000) to the mapped external LU or use the mapped external
LU as part of 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 emulation type to something different than OPEN-V, I/O
Suppression mode is set to Disable automatically.
When the external volume to be mapped has the VMA setting, the IO Suppression mode is
automatically set to Disable.
• Cache Mode
Specifies whether I/O operations use the XP10000/XP12000 cache memory when host I/O is
performed. If you select Enable, the host I/O goes to the XP10000/XP12000 cache and then to the
external LU cache (if necessary). If you select Disable, the host I/O goes directly to the external LU and
ignores the XP10000/XP12000 cache.
If you set the IO Suppression mode to Enable, the Cache Mode is set to Disable automatically. For
External Storage XP, it is recommended to set Cache Mode to Enable.
• Alternate Path
Number of alternate paths automatically set when mapped. Value can be from 0 to 7. Default is 1.
CAUTION: If the specified number of alternate paths cannot be set, an error appears in the Preset
list.
• CLPR (see ” External LU attributes set by mapping ” on page 30)
When cache memory is partitioned using XP Disk/Cache Partition, you can select the CLPR used to
access the mapped volume from the drop-down list. The SLPR number that the selected CLPR belongs to
appears to the right of the drop-down list. However, when the mainframe emulation type is selected in
Emulation Type, you can only select CLPRs belonging to SLPR number 0. The Limited check box
appears to the right of the SLPR number. To display only CUs defined for the selected SLPR, select the
Limited check box. To display all CUs, regardless of the SLPR, clear the check box. By default, the
Limited check box is selected.