User guide

Command Line Interface (CLI)
134 Modular SAN Array 1000 User Guide
Array Controller Configuration Commands
The CLI provides the ability to configure the MSA1000 array controller,
including:
■ Setting Global Variables
■ Setting the Controller ID
■ Changing the CLI Prompt
Each of these procedures uses the SET command, which changes the settings of
the MSA1000 Controller.
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
Example Command
SET GLOBALS EXPAND_PRIORITY=HIGH REBUILD_PRIORITY=HIGH
SYSTEM_NAME=”XXX” READ_CACHE=50 WRITE_CACHE=50
Command Options
EXPAND_PRIORITY=HIGH—the expand priority. 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=HIGH—the rebuild priority. 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.
230941-005_MSA1000_UG.book Page 134 Thursday, April 17, 2003 5:53 PM