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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.
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.

For more information about Drive Performance Monitoring and how to work with the data, see the CLI Syntax Reference in the 3ware SATA+SAS RAID Controller Card CLI Guide, Version 10.2.

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