Owner's manual

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100

Maintaining a Storage Array 93

The script command set provides two commands to define media scan

properties:

•

set virtualDisks

•

set storageArray

The

set virtualDisk c

ommand enables a media scan for the virtual disk.

The following syntax is the general form of the command:

set (allVirtualDisks | virtualDisk

[

virtualDiskName

] | virtualDisks [

virtualDiskName1

... virtualDiskNamen

] | virtualDisk <

wwid

mediaScanEnabled=(TRUE | FALSE)

The

set storageArray

command defines how frequently a media scan is

run on a storage array. The following syntax is the general form of the

command:

set storageArray mediaScanRate=(disabled | 1-30)

Running a Consistency Check

Consistency checks are performed when media scans are run, if consistency

check is enabled on the virtual disk. (See "Running a Media Scan" on page 91

for an explanation about setting up and running media scans.) During a

consistency check, all data blocks in a virtual disk are scanned, and deteriorated

data is corrected. The method of correction depends on the redundant array of

independent disks (RAID) levels:

• RAID 5 and RAID 6 virtual disks — Consistency is checked and repaired.

• RAID 1 virtual disks — The data is compared between the mirrored

physical disks, and data inconsistencies are repaired.

• RAID 0 virtual disks — No redundancy exists.

Before attempting a consistency check, you must enable the process with the

set virtualDisk command, which uses the following general form: