1.2 Major Components
The major components of the SH043-series cabinet are shown in Figures 1–2 and
1–3 and are as follows:
• Cabinet—The cabinet is a general-purpose enclosure that provides rack-
mount capability for standard 44.5 cm (17.5 inch) wide components. The
cabinet uses a standard metric rackmount bolt pattern with holes on 25 mm
(.98 inch) centers. Hinged front and rear doors and removable side panels
allow easy access to the cabinet interior. Casters and leveler feet are provided
to facilitate placement of the cabinet, and base trim
skirts are provided to
enhance its appearance.
• Shelf brackets—Movable
shelf brackets within the cabinet can be configured
to hold any of the StorageWorks shelf types. Six shelf positions may be used
in the front of the cabinet and four in the rear. Storage shelves may generally
be installed in any of the usable shelf positions, although some limitations
may be imposed by either weight or cable length restrictions. One shelf
position in the rear of the cabinet is reserved for power
cable distribution
unit (CDU) installation, and one is left open for proper airflow.
• SBB shelves—
StorageWorks building block (SBB) shelves are designed
to house any of the SBBs in the StorageWorks family. The shelves can accept
one or two power supply SBBs as well as a number of peripheral device SBBs.
SBB shelves provide the mechanical mounting, power, and signal interfaces
for the SBBs they house. The shelves are 445 mm (17.5 inch) in width and
are designed to slide into the shelf brackets.
• SBBs—StorageWorks building blocks (SBBs) are modular computer
peripheral devices or power units from the StorageWorks family. SBBs
may be disk drives, tape drives, shelf power supplies, battery backup units,
or other types of peripherals conforming to the
Small System Computer
Interface 2 (SCSI–2) specification. They are housed in both 3½-inch and
5¼-inch wide modular carriers designed to plug into slots in SBB shelves.
Connectors on the rear of each SBB mate with connectors in the SBB shelf to
provide the electrical interface between the two units.
• Controller shelves—Controller shelves are StorageWorks shelves designed
specifically to house SCSI–2 peripheral controller and cache memory modules.
These shelves may also accept one or two power supply SBBs. Controller
shelves provide the mechanical mounting, power, and signal interfaces for
the units they house. The cabinet allows for the mounting of one controller
shelf in the front and one in the rear. Digital’s SHZ1Z-ZZ, and SHZ2Z-ZZ
controllers are both qualified for use with the SH043-series cabinet. In special
situations, different controller types can be installed within the same cabinet.
• CDUs—Cable distribution units (CDUs) provide the connections necessary
to distribute ac power to the shelves in the SH043 cabinet. CDUs also
provide surge and spike protection, along with a circuit breaker to control
the incoming ac power. As an option, two CDUs can be configured with an
auxiliary ac power source to provide redundant primary power within the
cabinet.
1–4 Introduction
