Global commands, Setting global variables, Basic command – HP StorageWorks 1000 Modular Smart Array User Manual
Page 35: Command options
HP StorageWorks 1000/1500 Modular Smart Array Command Line Interface user guide
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Global commands
The CLI provides the ability to configure the MSA controller, enter global settings, and perform system-wide
commands, including:
• 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.
r
ebuild_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.