HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

12 Viewing Statistics and Histograms
Overview
The InForm OS 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 InForm OS 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 InForm OS 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 by either its ID or WWN.
◦ specific nodes.
◦ specific PCI slots.
◦ specific ports.
Additional filters can be used to refine the data output. Refer to the InForm OS Command Line
Reference for complete details about statpd command options and for sample command
data output.
NOTE: The Device Speed number does not represent a rotational speed for Solid State Drives
(SSD) 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.
118 Viewing Statistics and Histograms