Promise Technology Pegasus3 R4, Product Manual, Page: 100 / 232

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Managing the Pegasus3 Pegasus3 Product Manual
PDM
Predictive Data Migration (PDM) is the migration of data from the suspect disk drive to a spare drive,
similar to rebuilding a disk array. But unlike rebuilding, PDM automatically copies your data to a spare
drive before the drive fails and your logical drive goes Critical.
PDM can be triggered automatically by Media Patrol. Also see ”Running PDM on a Logical Drive” on
page 142.
Making PDM Settings
To make PDM settings:
1. Click on the Background Activities icon.
2. Click the Settings button.
3. Make the following settings are required:
• Click the PDM Rate dropdown menu and choose a rate:
• Low – Fewer system resources to PDM, more to data read/write operations.
• Medium – Balances system resources between PDM and data read/write operations.
• High – More system resources to PDM, fewer to data read/write operations.
• Highlight the current values in the block threshold fields and input new values.
Reassigned block threshold range is 1 to 512 blocks. Error block threshold range is 1 to
2048 blocks.
4. Click the
Confirm
button.
5. Click the X icon to close the background activities panel.
PDM