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RECOMMENDED USE: ROM-based diagnostics are the primary means of
testing the console environment and diagnosing the CPU, memory, Ethernet,
I/O buses, and SCSI and DSSI subsystems. Use ROM-based diagnostics in
the acceptance test procedures when you install a system, add a memory
module, or replace the following components: CPU module, memory module,
motherboard, I/O bus device, or storage device. Refer to Chapter 3 for
information on running ROM-based diagnostics.
Loopback Tests
Internal and external loopback tests are used to isolate a failure by testing
segments of a particular control or data path. The loopback tests are a subset
of the ROM-based diagnostics.
RECOMMENDED USE: Use loopback tests to isolate problems with the
COM2 serial port, the parallel port, and Ethernet controllers. Refer to
Chapter 3 for instructions on performing loopback tests.
Firmware Console Commands
Console commands are used to set and examine environment variables
and device parameters, as well as to invoke ROM-based diagnostics and
exercisers. For example, the
show memory
,
show configuration
, and
show
device
commands are used to examine the configuration; the
set
(bootdef_
dev, auto_action, and boot_osflags) commands are used to set environment
variables; and the
cdp
command is used to configure DSSI parameters.
RECOMMENDED USE: Use console commands to set and examine
environment variables and device parameters and to run RBDs. Refer to
Section 5.1 for information on configuration-related firmware commands and
Chapter 3 for information on running RBDs.
Operating System Exercisers (DEC VET)
The Digital Verifier and Exerciser Tool (DEC VET) is supported by the Digital
UNIX, OpenVMS, and Windows NT operating systems. DEC VET performs
exerciser-oriented maintenance testing of both hardware and operating
system.
RECOMMENDED USE: Use DEC VET as part of acceptance testing to
ensure that the CPU, memory, disk, tape, file system, and network are
interacting properly. Also use DEC VET to stress test the users environment
and configuration by simulating system operation under heavy loads to
diagnose intermittent system failures.
1–8 Troubleshooting Strategy
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