Adding new SCSI drive

DG Aviion (intel h/w) R4.20MU04

I plugged two new drives into my SCSI array, and need instructions on how to configure the filesystems...I've worked on Solaris (on Sun HW) boxes in the past, never has the pleasure of doing it on a DG.

1) Must I reboot for the system to "see" the drives? When I plugged in the drives, they spun up, and I have a green light on the array.

2) How do I determine the device IDs for the new drives? and can I just do a "newfs /dev/dsk/???" and "mount /dev/??? /mountpoint" to make the drives available?

Thanks in advance - Mike