Dell PowerVault MD3000 - Manual (Page 93)

Maintaining a Storage Array
93
The script command set provides two commands to define media scan
properties:
• set virtualDisks
• set storageArray
The set virtualDisk command 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:
set (allVirtualDisks | virtualDisk
[ virtualDiskName ] | virtualDisks [ virtualDiskName1
... virtualDiskNamen ] | virtualDisk < wwid >)
consistencyCheckEnabled=(TRUE | FALSE)