Avago Technologies 3ware SAS 9750-4i - Manual (Page 119)

Port Object Commands
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ra (Running Average). Running average is a measure of long-term averages
that smooth out the data, and results in older results fading from the average
over time.
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.
lct (Long Command Times). This a collection of the commands with the
longest read/write response time.
histdata (Histogram Data). The histogram categorizes the read/write
execution times and group them together based on time frames.
Summaries of the statistics for all drives on a controller are also available for
the inst, ra, and ext statistics, by using the command “/cx show dpmstat
[type=inst|ra|ext]” on page 38. For more information, see “Drive Performance
Monitoring” on page 241 of the 3ware SATA+SAS RAID Controller Card
Software User Guide, Version 10.0.
Example of running average statistics (RA)
//localhost> /c0/p3 show dpmstat type=ra
Queue Xfer Resp
Port Status Unit Depth IOPs Rate(MB/s) Time(ms)
--------------------------------------------------------------
p3 OK u0 0 435 25.249 2
Example of long command times statistics (LCT)
//localhost> /c0/p3 show dpmstat type=lct
Port Status Unit
------------------------------
p3 OK u0
Resp
Date Time Time(ms) --------- CDB / ATA Task File (hex) -----------
---------------------------------------------------------------------------
2007-02-09 13:47:57 383.216 00 80 60 40 92 9f 8a 40 1a 00 00 00 00 00 00 00
2007-02-09 13:47:57 390.809 00 80 60 40 13 eb 30 40 26 00 00 00 00 00 00 00
2007-02-09 13:47:57 405.478 00 80 60 40 61 11 20 40 26 00 00 00 00 00 00 00
2007-02-09 13:47:57 410.379 00 80 60 40 cd 8b b9 40 23 00 00 00 00 00 00 00
2007-02-09 13:47:57 419.002 00 80 60 40 5e df d1 40 29 00 00 00 00 00 00 00
2007-02-09 13:47:57 444.250 00 80 60 40 8b c0 36 40 2e 00 00 00 00 00 00 00
2007-02-09 13:47:57 527.994 00 80 60 40 6e a5 b6 40 03 00 00 00 00 00 00 00
2007-02-09 13:47:57 569.429 00 80 60 40 3b e2 02 40 2d 00 00 00 00 00 00 00
2007-02-09 13:47:57 609.526 00 80 60 40 27 1c e9 40 2b 00 00 00 00 00 00 00
2007-02-09 13:47:57 612.051 00 80 60 40 dd 0b d1 40 2c 00 00 00 00 00 00 00
Note that in addition to the time and date stamps of the commands with the
long response times, their corresponding CDB or ATA Task File is displayed.