Installation guide

C
Support of the CI and HSC Hardware
The Computer Interconnect (CI) bus is a high-speed, dual-path bus that
connects processors and Hierarchical Storage Controllers (HSCs) in a
computer room environment. An HSC is an I/O subsystem that is a
self-contained, intelligent mass storage controller that provides access to
disks and tapes from multiple host nodes attached to the CI bus.
_______________________ Note _______________________
The Tru64 UNIX implementation has the following limitations:
• You can attach a maximum of four HSCs to a CI bus.
• You can attach a single CI bus to a host.
• Under no circumstances can a Tru64 UNIX node participate
as a VMS cluster member. A configuration that includes a
VMS system and a Tru64 UNIX system residing on the same
CI bus is not supported.
Tru64 UNIX supports Digital’s System Communication Architecture (SCA)
for CI port adapters and HSCs. SCA implements port and class driver
support, and standardizes the ways in which TMSCP (tms) and MSCP (ra)
devices are handled. SCA separates features into different architectural
layers, thus minimizing the effect that software changes to one layer have
on other layers.
C.1 Hardware Setup, Restrictions, and Revision Levels
For information on physical components and setup, refer to the HSC
hardware documentation and the hardware documentation for your
processor and supported devices. Only processors with CI adapters can
support HSC configurations.
When setting up the HSC controller hardware, you should attach a
terminal to the HSC in order to use commands to get or set HSC
parameters, to monitor connections between remote systems, and to
identify the disk or tape status.
The maximum number of hosts on a CI bus is 16. The host number for any
host on the CI bus must be between 0 and 15.
Support of the CI and HSC Hardware C–1