106
Vess A Class NVR Storage Appliance
Promise Technology
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.
