Compaq StorageWorks SSL2000 Series Reference Manual page 18

1-4 Compaq StorageWorks SSL2000 Series Library Reference Guide
In a library system with many drives, it might be desirable to use multiple
SCSI buses for the drives so the data transfer rate of the drives is not limited
by bus bandwidth. Individual drives can be connected to separate hosts. Using
special software, one of the hosts can act as a master server, processing all
robotics commands and permitting several hosts to share a common database.