The modification priority defines how much processing time is allocated for logical drive modification operations versus system performance. The higher the priority, the faster logical drive modification operations complete, but the slower system I/O is serviced.
Logical Drive modification operations include reconstruction, copyback, initialization, media scan, defragmentation, change of RAID level and change of segment size.
The modification priority is set for each individual logical drive using a slider bar on the Logical Drive>>Properties dialog. There are five relative settings on the reconstruction rate slider bar ranging from Lowest to Highest. The actual speed of each setting is determined by the controller.
Note: The modification priority is changed immediately when you move the slider bar, although you may notice a slight delay if you have many or large logical drives reconstructing. See Specifying Logical Drive Properties.