3Ware 9550SXU-12 User Guide - Page 266

Troubleshooting • Display a DPM Summary. This shows whether DPM is On or Off, and 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. On a per-port basis, you can display five different statistical reports: • Instantaneous. This measurement provides a short duration average. (/cx/px show dpmstat type=inst) • 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 (/cx/px show dpmstat type=ra) • Long Command Times. This a collection of the commands with the longest read/write response time. (/cx/px show dpmstat type=lct • Histogram Data. The histogram categorizes the read/write execution times and group them together based on time frames. (/cx/px show dpmstat type=histdata) • 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. (/cx/px show dpmstat type=ext) • Clear Individual Statistic Counters. On a per-port basis, you can clear 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 254 3ware SAS/SATA RAID Software User Guide, Version 9.5.1