Adaptec 2020ZCR Reference Guide - Page 160

controller Commands controller rescan To rescan the SCSI channels on the currently opened controller and update all underlying structures, use the controller rescan command. The effect of this command is to verify currently connected disks or to recognize new disks added to the channel. This command rescans the disks for the arrays and loads the volatile array and the partition tables from disks again. If nothing on the disks has changed, controller rescan should have no visible effect. However, if any disk partition structures have changed, this command causes those changes to be reflected in the array and partition lists in the controller memory. If you add disks to the controller, the rescan enables you to use those disks. Syntax controller rescan 4-14