3Ware 9550SXU-12 User Manual page 266

Troubleshooting
254
•
Display a DPM Summary
provides summary statistics for drives attached to a controller.
(/cx show dpmstat)
Note that if DPM is Off, this summary may still show data, although that
data will be static, and not changing over time. Disabling DPM does not
clear the existing data. That is done separately, on a per-port basis (see
below.)
You can also show a subset of summary data, for individual types of
statistics (instantaneous, running average, or extended drive statistics), by
specifying a type attribute with the command.
• Display Specific Drive Statistic
five different statistical reports:
• Instantaneous.
(/cx/px show dpmstat type=inst)
• Running Average.
averages that smooth out the data, and results in older results fading
from the average over time (/cx/px show dpmstat type=ra)
•
Long Command Times.
longest read/write response time. (/cx/px show dpmstat type=lct
•
Histogram Data.
times and group them together based on time frames.
(/cx/px show dpmstat type=histdata)
• Extended Drive Statistics.
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.
(/cx/px show dpmstat type=ext)
•
Clear Individual Statistic Counters.
specific statistic counters, using these commands:
• /cxpx set dpmstat=clear
• /cxpx set dpmstat=clear type=ra
• /cxpx set dpmstat=clear type=lct
• /cxpx set dpmstat=clear type=ext
3ware SAS/SATA RAID Software User Guide, Version 9.5.1
. This shows whether DPM is On or Off, and
. On a per-port basis, you can display
This measurement provides a short duration average.
Running average is a measure of long-term
This a collection of the commands with the
The histogram categorizes the read/write execution
The extended drive statistics refers to
On a per-port basis, you can clear