HP StorageWorks 1000/1500 Modular Smart Array Command Line Interface user guide (347282-004, June 2007)

HP StorageWorks 1000/1500 Modular Smart Array Command Line Interface user guide 35
Global commands
The CLI provides the ability to configure the MSA controller, enter global settings, and perform system-wide
commands, including:
• Setting global variables
• Setting the controller ID
• Setting hard addressing
• Changing the CLI prompt
• Updating MSA firmware
• Disabling a controller for removal
• Overriding the ACU lock
• Enabling or disabling debug console logging
Setting global variables
A single command with a variety of parameters is used to set the expand priority, the read/write ratio, and
the system name.
Basic command
set globals [expand_priority=p] [rebuild_priority=r] [system_name=”name”]
[read_cache=r] [write_cache=w]
Command options
expand_priority=p—the expand priority, where p represents the priority setting of low, medium, or
high. Used when expanding an array to set the priority of array expansions in relation to input/output
operations. See below for detailed information about these settings.
rebuild_priority=p—the rebuild priority, where p represents the priority setting of low, medium,
or high. Used when rebuilding an array to set the priority of an array rebuild in relation to input/output
operations. See below for detailed information about these settings.
• low—expansion or rebuild takes place only when the array controller is not busy handling normal
I/O requests. This setting has minimal effect on normal I/O operations. However, there is an
increased risk that data will be lost if another physical drive fails while the rebuild is in progress.
• medium—expansion or rebuild occurs for half of the time, and normal I/O requests are handled
during the rest of the time.
• High—rebuild or expansion occurs at the expense of normal I/O operations. Although system
performance is affected, this setting provides better data protection because the array is vulnerable
to additional drive failures for a shorter time.
system_name=”name”—the system name, where “name” represents any user defined phrase, up to
20 alphanumeric characters. Quotation marks are required around the name.
read_cache=r—the read cache, where r specifies the read cache as a percentage of the total cache.
write_cache=w—the write cache, where r specifies the write cache as a percentage of the total
cache.
NOTE: The sum of read_cache and write_cache must equal 100.