Product manual
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VTrak A-Class Product Manual Promise Technologies
PDM
Predictive Data Migration (PDM) is the migration of data from the suspect physical drive to a spare drive,
similar to rebuilding a logical drive. But unlike Rebuilding, PDM constantly monitors your physical drives and
automatically copies your data to a spare drive before the physical drive fails and your logical drive goes Critical.
The PDM Rate is congured in the Background Activities Settings menu (see page 84).
To run PDM:
1. Go to SAN > Background Activities menu tab
2. Click on the
Play
icon (blue triangle inside blue circle) to bring up the PDM menu.
3. Choose a
Source
and a
Target
physical drive.
4. Click on the Save button to begin the rebuild.
baCkgrounD synChronization
Synchronization is automatically applied to redundant logical drives when they are created. Synchronization
recalculates the redundancy data to ensure that the working data on the physical drives is properly in sync.
The Background Synchronization Rate is congured in the Background Activities Settings menu (see page
84).
rEDunDanCy ChECk
Redundancy Check is a routine maintenance procedure for fault-tolerant disk arrays (those with redundancy)
that ensures all the data matches exactly. Redundancy Check can also correct inconsistencies.
The Redundancy Check Rate is congured in the Background Activities Settings menu (see page 84).