Quality Solaris 10 software:

Very interesting things can turn up while you are testing Solaris 10 iSCSI support make sure it behaves nicely in the face of dead logical disks. Like, say:

# format
Searching for disks...
Mode sense page(3) reports nsect value as 63, adjusting it to 0
Error: can't open selected disk '/dev/rdsk/c2t1d0p0'.
Arithmetic Exception - core dumped

(I was running format to see what disks it still saw; format is often the easiest way to inventory disks on Solaris.)