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Drive Performance Monitoring

www.lsi.com/channel/products 241

Drive Performance Monitoring

When one drive in a RAID unit is responding much slower than others, it

reduces the performance of the entire unit.

Drive Performance Monitoring (DPM) is now available to measure drive

performance, and to help identify when a specific drive is causing problems

so that you can have the drive manufacturer repair or replace it.

DPM is an advanced trouble-shooting tool. Commands are available through

the 3ware CLI to enable and disable DPM, and to see a range of different

statistics. These statistics can be useful to LSI technical support to help you

troubleshoot problems with your RAID controller and units.

Types of DPM Statistics

The following drive statistical data can be stored and reported:

• Queue depth, which indicates the number of read/writes that are

currently outstanding.

•IOP, which indicates the number of read/writes that have completed

• Transfer rate, which indicates the number of sectors that have been read/

written

• Response time, which indicates the execution time of all commands

• Command read/writes, which indicates the drive and drive sectors'

accumulated read and write commands.

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 SATA+SAS RAID Controller Card CLI Guide, Version

10.0.

•

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

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