HP StorageWorks XP Remote Web Console Software - Manual (Page 98)

CAUTION:
To use the mapped external LU for products other than XP Flex Copy (such as XP Cache LUN, XP
Auto LUN, XP Continuous Access, XP Continuous Access Journal, and XP Business Copy), set
IO Suppression mode to Disable.
CAUTION:
To set I/O Suppression mode to Disable, XP External Storage must be installed.
CAUTION:
To set IO Suppression mode to Enable, XP Flex Copy must be installed.
• Cache Mode
Specifies if the write I/O from the host is propagated synchronously or asynchronously to the ex-
ternal 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.
Data that is not written by the host (for example, data written by XP Business Copy) is asynchron-
ously destaged to the external array regardless of the Cache Mode setting.
If you set IO Suppression mode to Enable, Cache Mode is automatically set to Disable.
CAUTION:
If you set Disable, XP Cache LUN's bind mode cannot be set.
• 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 XP External Storage select the first CU:LDEV number for the mapped internal LDEV, leave
the default (“- : -”). XP External Storage 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 )
Configuring external LUs 98