When changing, adding or removing SCSI disks or CD-ROMs (or in my case, changing the SCSI2SD configuration to emulate different disks), Solaris 2.6 on my SPARCstation 10 doesn't automatically pick up the new disks on boot.
Instead, one has to manually do this. I googled it, and here it is for future reference:
drvconfig # rescan for devices
disks # rebuild /dev links for disk devices