HP StorageWorks External Storage XP user guide for the XP12000, XP10000, SVS200 (T1706-96009, October 2007)

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
storagedevice(seeExternal LU attributes set by mapping).
HP recommends that you set cache mode to Disable.
NOTE:
•IfyousettheIO Suppression mode to Enable, Cache Mode becomes Disable.
•IfyouselectDisable, Cache LUN XP's bind mode cannot be set.
•Ifyouspecified a mainframe-system emulation type for the mapped LU, host I/O is always
propagated asynchronously to the external LU regardless of the Cache Mode setting.
• Alternate Path
Number of alternate paths automatically set when mapped. Value can be from 0 to 7.Defaultis1.
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 volume from the list. The SLPR number that the selected CLPR belongs to appears
on the right of the list. However, if 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.
• Select Paths button
Displays the Select Paths pane (Figure 43). Use the Select Paths pane to select paths as candidates for
primary and alternate paths and select paths that cannot be set to primary and alternate paths. By
default, all paths with a confirmed connection status of normal are set as candidates for primary and
alternate paths. However, to set a specific path as the alternate path, use the Select Paths pane to
specify candidates for alternate paths. Alternate paths are automatically set from the candidates,
as many as the number set in Alternate Path.
CAUTION:
If you do not set alternate paths on the Select Paths pane, alternate paths are automatically set
according to the WWN selected in the Device tree on the LU Operation pane when you started
the Add LU operation.
• Clear button
Resets all the external LU's attributes.
• CU list
CU number of the local array to which you want to map the external LU. Select the CU number from
the list. When the Limited check box is selected, the selection range is limited to the CU belonging to
the SLPR displayed in CLPR.
• Linear button
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Configuring external LUs