HP 3PAR Command Line Interface Administrator's Manual: HP 3PAR OS 3.1.2 (QR482-96525, September 2013)

12 Viewing Statistics and Histograms
Overview
The HP 3PAR CLI allows you to view aspects of system performance over time. You can view
statistics for the performance of VLUNs, virtual volumes, ports, physical disks, data cache memory,
and CPU usage, using variations of the stat command.
In addition, the HP 3PAR CLI provides service time and I/O size histograms for system resources
such as chunklets, logical and physical disks, ports, VLUNs, and virtual volumes.
Viewing Statistics
This section provides instructions on using commonly used CLI commands to access performance
statistics. The commands described here are a subset of the statistics commands available. For a
complete list of statistics commands, see the HP 3PAR Command Line Interface Reference.
Performance statistics are available for the following:
• physical disks
• ports
• VLUNs
• virtual volumes
• data cache memory
• CPU usage
Viewing Statistics for Physical Disks
To view physical disk statistics, issue the statpd command.
Data output can be further refined to display only physical disk statistics from:
• a specific physical disk, specified by either its ID or WWN.
• specific nodes.
• specific PCI slots.
• specific ports.
Additional filters can be used to refine the data output. For complete details about statpd command
options and for sample command data output, see the HP 3PAR Command Line Reference.
NOTE: The device speed number does not represent a rotational speed for SSDs without spinning
media. It is meant as a rough estimation of the performance difference between the drive and the
other drives in the system. For FC and NL drives, the number corresponds to both a performance
measure and actual rotational speed. For an SSD, the number is to be treated as a relative
performance benchmark that takes into account I/O per second, bandwidth, and the access time.
Viewing Port Statistics
To view port statistics, issue the statport command.
By default, only statistics for data transfers are displayed. You can optionally display statistics for
control transfers, or both data and control transfers, by issuing the statport -ctl or statport
-both command, respectively.
Data output can be further refined to display only port statistics from:
• specific nodes.
• specific PCI slots.
Overview 121