some more commands to scan "new" io devices:

disks     - creates /dev entries for hard disks attached to the system
drvconfig - configure the /devices directory
devlinks  - adds /dev entries for miscellaneous devices and pseudo-devices
tapes     - creates /dev entries for tape drives

devfsadm,
devfsadmd - administration command for /dev and /devices
cfgadm    - configuration administration


How to scan for new devices on systems without 'devfsadm'?

The -r Option specifies another root:

# mkdir /tmp/y
# /usr/sbin/drvconfig -r /tmp/y

Find instances of the sd-driver (SCSI-disks):

% find /tmp/y -name sd\* -print | less