3DM 2 Online Help

Available DPM Commands
Drive Performance Monitoring commands are available through the CLI. An overview of the commands is provided below. For more information about the command syntax and for examples of the report output, see the CLI Syntax Reference in the 3ware SAS/SATA RAID Controller CLI Guide.

| Enable DPM. This starts the collection of statistics for drives attached to your RAID controller. (/cx dpmstat=on).

For efficient collection of data, initiate read/write activity on the specified controller. The numbers will change over time as the new and old data are averaged.

| Disable DPM. This stops the collection of statistics. (/cx dpmstat=off)

DPM is disabled by default since there is overhead in maintaining the statistics. DPM is also disabled following a reboot or power-on. Turning off DPM does not clear the statistical data that has been recorded. To clear the data, use the command /cx/px set dpmstat=clear [type=ra|lct|ext].

| 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

Related Topics
  Types of DPM Statistics
  Drive Performance Monitoring
  Before Contacting Customer Support
  Basic Troubleshooting: Check This First

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