HP StorageWorks XP Remote Web Console Software User Manual
Page 88
If you do not suppress I/O from hosts to the mapped external LU, select Disable (for example,
for XP External Storage).
When setting the emulation type to something other than OPEN-V, I/O 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 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
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.
Data that is not written by the host (for example, data written by XP Business Copy) is
asynchronously 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
(
) 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 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.
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Configuring external LUs