AlphaServer 8400 System
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SCSI Disk and Tape PIUs
A maximum of three SCSI PIUs can be installed in the system cabinet or six in an
expander cabinet. The PIU can occupy any quadrant in the main or expander cabinet.
The PIU can contain up to seven 3.5-inch or two 5.25-inch disks. Supported devices
include SCSI disk drives, CD-ROM, and tape drives.
PCI PIUs
Up to two PCI PIUs can be installed in the system or expander cabinet. A PCI PIU
occupies one quadrant, either Q2 or Q4. A PCI PIU can contain two PCI shelves, each
containing a 12–slot card cage, configured as three 4-slot PCI buses, or one PCI and
one SCSI shelf. EISA options can be used on systems with a KFE70 adapter. A
system with a KFE72 adapter can only contain PCI options (see Chapter 4).
XMI PIUs
A maximum of two XMI PIUs can be installed in the system or expander cabinet on
OpenVMS or DIGITAL UNIX systems. Each XMI PIU occupies two quadrants and
has 14 slots. Twelve slots can contain the following modules: CIXCD, DEMFA,
DEMNA, KZMSA, and KFMSB. One module must be installed in slots 1 or 14. Slot
7 contains the clock module, and slot 8 contains the DWLMA module.
Fu PIUs
One Fu PIU can be installed in the system or expander cabinet on OpenVMS
or DIGITAL UNIX systems. The Fu PIU occupies one quadrant and has 10
slots. The DWLAA module is standard and is installed in slot 5.
Battery PIUs
The system can be equipped with an optional battery PIU to provide power in case of a
power failure. Each regulator requires a battery pack mounted in the bottom of the
system cabinet. The battery PIUs provide a minimum of 8 minutes of full system
operation when fully charged.
Additional Power Regulators
AlphaServer 8400 systems using H7263–AC/AD power regulators, which require 3-
phase input can have a second or third power regulator installed as backup should a
regulator fail. Systems requiring battery backup must have the H7263–AA/AB
regulators installed.
Older AlphaServer 8400 systems may have one H7264 power regulator, using single-
phase AC, and a second may be required depending on the system configuration. This
system has no support for battery backup operation or for N+1 redundancy.
