HP StorageWorks Modular Smart Array 1000 HP StorageWorks 1000/1500 Modular Sma - Page 32

Changing the cache setting for a LUN, Setting the preferred path for a LUN

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The RAID level of Unit 0 will now be 5. Unit 0 is being migrated. Use "show unit 0" to monitor progress. Changing the cache setting for a LUN To enable or disable the array accelerator cache for a specific LUN: Basic command set unit Command options #-the number of the LUN to modify. In this example, LUN 0 will be modified. cache=enable|disable-either enables or disables the use of the array accelerator cache for the specified LUN. Example command and response CLI> set unit 0 cache=enable Cache for unit 0 has been enabled. Setting the preferred path for a LUN NOTE: This command is available only with active/active firmware (v6.x or later). Configures an explicit preferred controller path for specified logical units. Host requests that are directed to the non-preferred controller will be delayed slightly, due to data and command transfer through the inter-controller link. If implicit path changes are enabled (see "Enabling/disabling automatic path switching" on page 34), controller firmware may automatically switch controller paths for unit(s) based on host request load. Basic command set preferred_path [controller] [reset] Command options controller-indicate the controller by entering this_controller, other_controller, controller=1, or controller=2. reset-restore the last explicitly configured path for the specified LUNs. unit_list-indicate the LUNs to set by entering all, the unit number of a specific LUN, or a range of unit numbers. 32 Using the CLI

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32
Using the CLI
The RAID level of Unit 0 will now be 5.
Unit 0 is being migrated.
Use “show unit 0” to monitor progress.
Changing the cache setting for a LUN
To enable or disable the array accelerator cache for a specific LUN:
Basic command
set unit <#> <cache=[enable|disable]>
Command options
#—the number of the LUN to modify. In this example, LUN 0 will be modified.
cache=enable|disable
—either enables or disables the use of the array accelerator cache for the
specified LUN.
Example command and response
CLI> set unit 0 cache=enable
Cache for unit 0 has been enabled.
Setting the preferred path for a LUN
NOTE:
This command is available only with active/active firmware (v6.x or later).
Configures an explicit preferred controller path for specified logical units. Host requests that are directed to
the non-preferred controller will be delayed slightly, due to data and command transfer through the
inter-controller link.
If implicit path changes are enabled (see ”
Enabling/disabling automatic path switching
” on page 34),
controller firmware may automatically switch controller paths for unit(s) based on host request load.
Basic command
set preferred_path [controller] [reset] <unit_list>
Command options
controller
—indicate the controller by entering
this_controller
,
other_controller
,
controller=1
, or
controller=2
.
reset
—restore the last explicitly configured path for the specified LUNs.
unit_list
—indicate the LUNs to set by entering
all
, the unit number of a specific LUN, or a range
of unit numbers.