User`s guide

Configuration
2.2 Mass Storage Devices
The system enclosure determines the combinations of internal mass storage
devices in a KA52/53/54 system. See the VAX 4000 BA42B Enclosure
Maintenance manual for more information.
2.2.2 External Mass Storage Devices
The external mass storage devices connect to KA52/53/54 systems through
either the DSSI or the SCSI connector on the back of the system enclosure.
In KA52/53/54 systems, the SCSI bus supports a maximum of seven mass
storage devices. Therefore, the number of external mass storage devices that
you can connect depends on the number of mass storage devices that are
mounted inside the system enclosure.
The maximum number of mass storage devices in the system enclosure is five,
three DSSI disks and two SCSI devices. The SCSI device may be a disk, a
tape, or a CD–ROM drive. However, there can be no more than three disk
drives total in this system enclosure.
A KA52/53/54 system supports the SZ series of mass storage expansion boxes.
The SZ number defines the contents of each expansion box. Figure 2–1 shows
the numbering system for SZ expansion boxes.
Configuration 2–3