Controller Object Commands
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ext (Extended Drive Statistics).
The extended drive statistics refers to
statistics of a drive's read commands, write commands, write commands with
FUA (Force Unit Access), flush commands, and a drive sectors's read, write,
and write commands with FUA.
Additional statistics are available for drives at specific ports. For details, see
“/cx/px show dpmstat type=inst|ra|lct|histdata|ext” on page 112.
Drive Performance Monitoring can be turned on and off using the command
“/cx set dpmstat=on|off” on page 70.
Example of inst drive statistics:
To display a summary of instantaneous data for the set of drives attached to
the controller, use command
/c
x
show dpmstat
. (since inst is the default, you
do not have to explicitly enter it in the command).
Since this is a controller-level command, the output provides summary
information for the set of drives attached to the controller. For statistics about
a drive attached to a specific port, see “/cx/px show dpmstat
type=inst|ra|lct|histdata|ext” on page 112.
In the configuration information displayed below, the Performance Monitor is
shown to be On, “Version” refers to the firmware version of the Performance
Monitor, “Max commands for averaging” refers to the maximum number of
commands that can be saved and used for calculating the average, and “Max
latency commands to save” refers to the maximum number of commands with
high latency that are saved. The amount of statistics data in the buffer is
determined by these configurations and the memory constraints of the system.
These configuration settings cannot be changed at this time.
//localhost> /c0 show dmpstat
Drive Performance Monitor Configuration for /c0 ...
Performance Monitor: ON
Version: 1
Max commands for averaging: 100
Max latency commands to save: 10
Requested data: Instantaneous Drive Statistics
Queue Xfer Resp
Port Status Unit Depth IOPs Rate(MB/s) Time(ms)
--------------------------------------------------------------
p0 NOT-PRESENT - - - - -
p1 NOT-PRESENT - - - - -
p2 OK - - - - -
p3 OK u0 10 93 2.907 85
p4 OK u1 10 84 2.640 95
p5 OK - - - - -
p6 NOT-PRESENT - - - - -
p7 NOT-PRESENT - - - - -
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