Promise Technology VESS A7800 handleiding

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Handleiding

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,

more to data read/write operations.

• Medium – Balances system resources between Redundancy

Check and data read/write operations.

• High – More system resources to Redundancy Check,

fewer to data read/write operations.

2. Click the Submit button.

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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

uncon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

Conrm

button.

Promise Technology Product Manual

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