HP XP Data Shredder Software - Manual (Page 90)

CAUTION:
To use the mapped external LU for products other than Flex Copy XP (such as Cache LUN XP, Auto
LUN XP, Continuous Access XP, Continuous Access XP Journal, and Business Copy XP), set IO
Suppression mode to Disable.
CAUTION:
To set I/O Suppression mode to Disable, External Storage XP must be installed.
CAUTION:
To set IO Suppression mode to Enable, Flex Copy XP must be installed.
• Cache Mode
Specifies if the write I/O from the host is propagated synchronously or asynchronously to the external
storage device ( External LU attributes set by mapping ).
To propagate write I/Os from the host to the external array asynchronously, select Enable.
To propagate write I/Os from the host to the external array synchronously, select Disable.
If you set IO Suppression mode to Enable, Cache Mode is automatically set to Disable.
CAUTION:
If you set Disable, Cache LUN XP's bind mode cannot be set.
CAUTION:
If you set the mapped LU to a mainframe-system emulation type, the host I/O is always propagated
asynchronously to the external LU, regardless of the Cache Mode setting.
• Start CU:LDEV
First CU:LDEV number in the series of mapped destination internal LDEVs. The default is “- : -”.
Interval also appears. The default is 0.
To have External Storage XP select the first CU:LDEV number for the mapped internal LDEV, leave
the default (“- : -”). External Storage XP searches for an available CU:LDEV number starting with
00:00, and selects the first one it finds.
To specify the first CU:LDEV number and interval, click Select LDEV. The Select LDEV window
( Figure 49 ) appears.
• Alternate Path
Number of alternate paths automatically set when mapped. Values 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 )
When cache memory is partitioned using XP Disk/Cache Partition, you can select the CLPR used to
access the mapped LU from the list. The SLPR number that the selected CLPR belongs to appears on
the right of the list. However, when you select a mainframe emulation type in Emulation Type, you can
only select CLPRs belonging to SLPR number 0. The Limited check box appears on the right of the SLPR
90 Configuring external LUs