Control Data Corporation CYBER 170 Series Operator's Manual page 163

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xx EST ordinal of the device.
cc Channel number.
uu Physical unit number (0 through 778).
Assuming the inoperative machine is the machine holding
the reservation, clear the reservation or direct MREC to
clear it by using the following procedures.
To clear a controller reservation, activate the deadstart
switch on the machine which is down.
To clear a unit reservation, perform one of the following
procedures.
• On an 885 or 844 device that is connected to a
7155 controller, activate the deadstart switch on
the machine which is down.
• On an 844 device that is not connected to a 7155
controller, toggle the OFF LINE/ON LINE switch
on the back of the drive to OFF LINE and then
back to ON LINE.
• If either of the preceding procedures cannot be
performed, select the OP=R option to clear an 844
or 885 device reservation.
60435600 K
I
NOTE
I
Do not select the OP=R option unless the
other procedures cannot be perform ed.
It
is recommended that
all
machines in
the multimainframe environment be put
in IDLE status or put in STEP mode when
the OP=R option is selected.
Once the correct action has been taken, type
K.GO.
to continue processing. If the reservation is still not
cleared, you are again notified. Repeat one of the steps
above or type
K.OP=I.
This directs MREC to ignore certain operations on the
device. Processing may then continue.
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