Dell PowerVault MD3220 - Configuration: Disk Groups and Virtual Disks; Creating Disk Groups and Virtual Disks

Maintaining a Storage Array 93
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)
book.book Page 93 Friday, March 4, 2011 10:45 AM