Selecting The Deadstart Parameters; Selecting The Deadstart Level - Control Data Corporation CYBER 170 Series Operator's Manual

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NOTE
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The CMRDECK can be selected only
during a level 0 (initial) deadstart. If it is
necessary to perform a levell,
2,
or
3
(recovery) deadstart, the CMRDECK
selected during the most recent level
0
deadstart must be used. Ref er to the
discussion under Selecting the Deadstart
Level for information concerning the
levels of deadstart.
The number of the CMRDECK to be used is selected by
setting the switches (bits 5 through 0) shown in the
unshaded area of the deadstart panel illustrated.
xxx xxx
xxx xxx
Specifies the CMRDECK number
(0
through 778) to be used.
For example, assume that CMRDECK number
268
is to be
used to define the _equipment configuration at deadstart. In
this case, the corresponding switches on the deadstart
panel would be set as follows
(0
indicates that switch is
placed in down position; 1 indicates that switch is placed in
up position):
xxx xxx 010 110
It
is not necessary to specify the CMRDECK on the
deadstart panel. In this case, the *P* display (described
later in this section) allows you to specify the CMRDECK
to be used from the console keyboard. In addition, values
entered via the options display have precedence over those
specified on the deadstart panel. For example, bits 0
through
5
of word 13 on the deadstart panel (xxx xxx) could
be set to select the CMRDECK most frequently used by an
installation. Another CMRDECK could then be selected
when necessary via the *P* display during a level zero
deadstart.
SELECTING THE DEADSTART PARAMETERS
You can select deadstart parameters to control
miscellaneous deadstart functions by setting bits 8 through
6 in word 13. The switches that represent this field of bits
are shown in the . unshaded area of the deadstart panel
illustrated.
ppp
ppp
Specifies
functions.
Value of ppp
Switch
(bits 8-6) Position
Bit 8
Unused
Bit 7 =.0 Down
miscellaneous deadstart
Description
Indicates that the system
will not save the contents of
PPO in central memory when
performing an express
deadstart dump.
Value of ppp
(bits 8-6)
Bit 7 = 1
Bit
6 = 0
Bit
6
=
1
Switch
Position
Up
Down
Up
Description
Indicates that the system
will attempt to save the
original contents of PPO in
central memory when
performing an express
deadstart dump. This will
be done only if a free block
of central memory is
available. A free memory
block is field length beyond
C MR which is not assigned
to a subsystem.
If there is no free block of
central memory available,
the original contents of PPO
might not be saved.
Indicates that the
CMRDECK will not be
displayed during deadstart.
Indicates that the
CMRDECK will be displayed
during all levels of deadstart.
SELECTING THE DEADSTART LEVEL
You can select one of four l.evels of deadstart by setting
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bits 10 and
9
in word 13. The switches that represent this
field of bits are shown in the unshaded area of the
deadstart panel illustrated.
rrr
rrr
Value of rrr
(bits 11-9)
000
Specifies the deadstart level.
Description
Indicates an initial or level 0 (zero)
deadstart in which the system is loaded
from the deadstart file. This is not
considered to be a recovery deadstart
al though permanent files, queue files (if
QPROTECT is enabledt), and system
dayfiles are recovered automatically.
An attempt to recover these files is
made on all levels of system deadstart.
Level deadstart is normally specified
under the following conditions.
• For the first deadstart
following a period in which the
system has been inoperative, or
has been used· for purposes
other than NOS operations.
• When a system malfunction has
occurred and other levels of
system deadstart prove
ineffective.
tRefer to the NOS Installation Handbook for more information on the QPROTECT installation option.
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