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Vess A6000 Series Storage Appliance for Video Surveillance
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.
PDM Settings
To change PDM setting the in Background Activities Settings menu:
1. 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.
2. 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.
3. Click the Submit button.
t
rAnsition
Transition is the process of replacing a revertible spare drive that is currently part of a disk array with an
unconfigured physical drive or a non-revertible spare drive.
Transition Rate
To change Transition Rate setting the in Background Activities Settings menu:
1. Click the Transition Rate drop-down menu and choose a rate:
• Low – Fewer system resources to Transition, more to data read/write operations.
•
Medium – Balances system resources between
Transition and data read/write operations.
•
High – More system resources to Transition, fewer to data read/write operations.
2. Click the Confirm button.
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Managing with the Web Manager
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