I do not happen to know your experience level, but many people
have presumed that just because such disk drives are on a disk board,
that they are internal drives.
That is incorrect -- no disk drives are ever 'internal' to an Enterprise computer; all are external devices.
(... only the CDROM and any internal tape are internal SCSI devices, for those computers)
A disk board simply gets power and device target numbering when they're on a disk board.
The SCSI pathing is still external.
There must be a cable, out from an I/O board and into the HD68 connector on the face of the disk board.
Those drives are no different that if they were in a multipak.
No SCSI cable ?Then no functional drives.
Bring the system down to OBP (properly) and run probe-scsi-all.
The drives must be recognized at that hardware level before
you can have any hope of an OS manipulating them.
Search Docs.Sun.Com for the board, whose part number is 501-3113.
That will point you toward the Systems Manual for that line of computer systems.It's a 4mb PDF file.
http://docs.sun.com/app/docs/doc/802-3845-11
Alternatively, you can use the SSH to find your E4000, then select its documentation link:
http://www.sun.com/products-n-solutions/hardware/docs/Servers/Midrange_Servers/ ultra_enterprise_4000/hardware/index.html