James Graham writes:
> 		((switch on drive sd3 here))
> 	berkeley# !!
> 	fsck /dev/rsd3a
> 		((driver re-probes for existence of sd3; discovers it and
> 		  sends a SCSI_MOTOR_START (or whatever))
> 	esp(0:3:0): Cybernetix Dinklephwat 4000 <13 heads, 8194 tracks, 2290 sectors>
> 	sd3 at esp0 target 3 lun 0 flags 0

 If I recall correctly, you could do this with a small program called
reprobe, that appeared on current-users or something like that a long
time ago. All it does is do an SCIOCREPROBE and the SCSI devices get
reprobed.