Sun Microsystems Enterprise 250 Owner's Manual page 120

The disk drives share the internal SCSI bus with the SCSI removable media devices
in the removable media assembly (RMA). The removable media SCSI cable provides
the termination for the internal SCSI bus.
For information about implementing RAID configurations, see "About Disk Array
Configurations and Concepts" on page 209.
Sun Enterprise 250 Server Owner's Guide ♦ Revision A, June 1998
86