HP StorageWorks Modular Smart Array 1000 HP StorageWorks 1000/1500 Modular Sma - Page 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. HP StorageWorks 1000/1500 Modular Smart Array Command Line Interface user guide 35