DELL MD3220 사용자 설명서

Configuration: Disk Groups and Virtual Disks

The following settings are removed/cleared during the procedure:

• Persistent reservations 
• Host-to-virtual disk mappings 
• Virtual disk copy pairs 
• Snapshot virtual disks and snapshot repository virtual disks 
• Remote mirror pairs 
• Mirror repositories 

Some components cannot be imported during the import disk group 

procedure. These components are removed during the procedure:

• Persistent reservations
• Mappings
• Virtual disk copy pairs
• Snapshot virtual disks and snapshot repository virtual disks

The media scan is a background operation that examines virtual disks to 

verify that data is accessible. The process finds media errors before normal 

read and write activity is disrupted and reports errors to the event log.

You cannot enable background media scans on a virtual disk comprised of 

Solid State Disks (SSDs).

Errors discovered by the media scan include:

• Unrecovered media error—Data could not be read on the first attempt or 

on any subsequent attempts. For virtual disks with redundancy protection, 

data is reconstructed, rewritten to the physical disk, and verified and the 

error is reported to the event log. For virtual disks without redundancy 

protection (RAID 1, RAID 5, and RAID 6 virtual disks), the error is not 

corrected but is reported to the event log. 

• Recovered media error—Data could not be read by the physical disk on the 

first attempt but was successfully read on a subsequent attempt. Data is 

rewritten to the physical disk and verified and the error is reported to the 

event log. 

book.book  Page 132  Monday, June 21, 2010  11:00 AM