Multimainframe Operation - Control Data Corporation CYBER 170 Series Operator's Manual

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MULTIMAINFRAME OPERATION
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This appendix gives rules and recommendations to follow in
operating a multimainframe system.
• Do not mount packs with duplicate labels.
• Ensure that shared removable devices are
mounted on an active machine before deadstarting
a second machine that will be accessing these
devices. Check the E,M display on the active
machine to determine if the devices are mounted.
None can have global unload (N) status set.
• Physically dismount a device only if the global
unload (N) status is displayed on the E,M display
for that device.
• If
a level
3
recovery deadstart is required, press
the DEADSTART switch but do not begin recovery
until all remaining active machines display the
message.
*MAcmNE DOWN*
at the respective system control poin~.
60435600 L
• If a level 3 recovery deadstart is not possible, or
if you attempted a level
3
deadstart and were not
successful, MREC must be run on
all·
machines
sharing disks with the down machine, followed by
a level
0
deadstart on the down machine.
• If you are deadstarting the first machine (no
machine is currently operating), you must use the
PRESET CMRDECK entry (refer to the
Installation Handbook for a description of
PRESET).
• Once the MREC utility has been run for an
inoperative machine, do not run any recovery
deadstart (other than level
0
deadstart).
Refer to the NOS System Maintenance Reference Manual
for more detailed information on multimainframe operation.
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