Sun Microsystems SPARCstation Voyager Service Manual page 35

If the SunDiag program has been selected during the operating system loading
procedure, it can be run at any time. The SunDiag system exerciser is usually located
in the directory /opt/SUNWdiag/bin. If the SunDiag system exerciser is not on the
system hard disk or server, you can load it from CD-ROM. For more information, see
the SunDiag User's Guide.
If the SunDiag tests pass, the system is operating properly. If the SunDiag tests fail,
the error messages indicate the part of the system which has failed. If the error
messages are not descriptive enough, you can run POST. See Chapter 3
Chapter 2 Diagnostic Overview 13