luxadm

 luxadm - administration program for the Sun Enterprise  Network Array (SENA), RSM, SPARCstorage Array (SSA) subsystems, and individual Fiber Channel Arbitrated Loop (FC_AL) devices

 luxadm probe

... and take the devices, e.g. /dev/rdsk/c4t600A0B800048F380000003DD4BB1FE0Fd0s2, and do

 luxadm display /dev/rdsk/c4t600A0B800048F380000003DD4BB1FE0Fd0s2

Other handy commands:

 luxadm -e port

Check read access:

dd if=/dev/dsk/c4t600A0B800048F380000003EC4BB30476d0s0 of=/dev/null bs=1024k count=100000

There is an "undocumented" utility: /usr/cluster/lib/sc/scsi

scsi -c inkeys -d /dev/rdsk/<device>

(check keys)

scsi -c scrub -d /dev/rdsk/<device>