DELL MD3220 User Manual

Planning: MD3200 Series Storage Array Terms and Concepts

Defragmenting consolidates the free capacity in the disk group into one 

contiguous area. Defragmentation does not change the way in which the data 

is stored on the virtual disks.

The maximum number of active, concurrent disk group processes per 

installed RAID controller module is one. This limit is applied to the following 

disk group processes:

• Virtual disk RAID level migration
• Segment size migration 
• Virtual disk capacity expansion
• Disk group expansion 
• Disk group defragmentation.

If a redundant RAID controller module fails with an existing disk group 

process, the process on the failed controller is transferred to the peer 

controller. A transferred process is placed in a suspended state if there is an 

active disk group process on the peer controller. The suspended processes are 

resumed when the active process on the peer controller completes or is 

stopped.

If you try to start a disk group process on a controller that does not have an 

existing active process, the start attempt fails if the first virtual disk in the disk group 

is owned by the other controller and there is an active process on the other 

controller.

The storage array supports a common configurable priority for the following 

RAID operations: 

• Background initialization
• Rebuild
• Copy  back
• Virtual disk capacity expansion
• Raid level migration

book.book  Page 45  Monday, June 21, 2010  11:00 AM