User Manual

Promise Technologies Management with WebPAM Pro

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 ﬁ elds 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.

TRANSITION

Transition is the process of replacing a revertible spare drive that is currently part of a disk array with an

unconﬁ gured 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

C o n ﬁ r m

button.

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.

Note

You can use the scheduler to set up a Redundancy Check

Schedule.

To set up a schedule, click the menu expander to the right of

the Scheduler tab and select Redundancy Check Schedule.

Redundancy Check Rate

To change Redundancy Check Rate setting the in Background Activities Settings menu:

1. Click the Redundancy Check Rate drop-down menu and choose a rate:

• Low – Fewer system resources to Redundancy Check,