DELL MD3220 사용자 설명서

Management: Firmware Downloads

If the RAID controller detects a media error while accessing data from a 

physical disk that is a member of a disk group with a redundant RAID level 

(RAID 1, RAID 5 or RAID 10), the controller tries to recover the data from 

peer disks in the disk group and uses recovered data to correct the error. If the 

controller encounters an error while accessing a peer disk, it is unable to 

recover the data and affected sectors are added to the unreadable sector log 

maintained by the controller. Other conditions under which sectors are added 

to the unreadable sector log include:

• A media error is encountered when trying to access a physical disk that is a 

member of a nonredundant disk group (RAID 0 or degraded RAID 1, 

RAID 5 or RAID 10).

• An error is encountered on source disks during rebuild.

Data on an unreadable sector is no longer accessible.

book.book  Page 187  Monday, June 21, 2010  11:00 AM