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3ware® User Guide > Troubleshooting > Drive Performance Monitoring

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 AMCC technical support to help you troubleshoot problems with your RAID controller and units.

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