Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head - Manual (Page 181)

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Vess R2000 Series 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.
See “Running PDM on a Disk Array” on page 194 and “PDM” on page 550.
M
Aking
PdM s
ettings
To make PDM settings:
1. Click the Administration tab.
2. Click the Background Activities icon.
The list of background activities appears.
3. Click the Settings button.
4. Make the following settings are required:
• Click the PDM Rate drop-down 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.
5. Click the Confirm button.