User`s guide
CHAPTER 5
VAX-ll/730
DIAGNOSTIC SUPERVISOR AND LOAD PATH
5.1
INTRODUCTION
The
V
AX-II
/730
diagnostic supervisor may be loaded off-line from the diagnostic distribution disk,
system disk, or from the
TU58
tape drive.
If
the user disk drive
is
not used by VMS, the supervisor
is
loaded from the distribution disk while the system
is
operating in the user mode. However, if the user disk
drive
is
unavailable, the supervisor
is
loaded from the system disk.
The
supervisor
is
loaded from the
TU58
only if it cannot be loaded from the user or the system disk drives.
NOTE
The
[SYSMAINT] directory on the system disk
must
contain
the
diagnostic
supervisor
file
ENSAA.EXE
before the supervisor can be booted
from
that
disk.
Loading the supervisor from the disk drive
is
considered loading through the primary load path.
In
contrast, loading the supervisor from the
TU58
is
considered loading through the secondary load path.
The
primary path
is
used first,
but
if the system has a hardware failure in the disk subsystem (IDC,
UDA50
or
their disk drives) or in the
CPU
cluster, the supervisor may be loaded through the secondary load path.
However, before the supervisor
is
loaded from the
TU58,
level 4 diagnostics are executed. If the level 4
diagnostics execute without error, the supervisor
is
executed, followed by the execution
of
level 3 disk
subsystem diagnostics.
5.2 LOADING
THE
SUPERVISOR
THROUGH
THE
PRIMARY
LOAD
PATH
The
V
AX-II
/730
computer system use IDC- or UDA50-based disks drives to provide the primary load
path for the diagnostic supervisor program.
NOTE
In this
chapter
where examples
of
commands
are
given
that
involve specifing devices, the device type is
shown
as
an
x (i.e.
»>B
Sx1). When this command
is actually typed the x should be substituted with the
code letter
of
the disk drive type. The code letters
for
the disk drive types
are
as
follows:
• Q
for
a RL02
or
R80 disk drive
• J
for
a RA60 disk drive
• U for a RA80
or
RA81 disk drive
For
example,
if
a procedure specifies
the
command
to
be typed
as
»>B
DxO
and you have a RA80 disk
drive
as
drive 0, then you would type
»>B
DUO.
5-1