Powering Off An Lmu-Dual Lmu Configuration; Powering Off The Standby Lmu; Powering Off An Lmu-Emergency - StorageTek 4410 Hardware Operator's Manual

If you give the switch command while processing is active, cartridges might be in-transit
in various LSMs. Recovery procedures occur automatically as described in
an Automatic LMU Switch" on page
software waits for the LSMs to complete a quick initialization and then re-drives the
requests building up in the queue.
Powering Off an LMU—Dual LMU Configuration
To power off the master LMU:
1. Place at least one station online to the standby LMU, if necessary. The station is now
on standby.
2. Press the power switch on the operator panel of the master LMU. (On older models,
press to "0"; the indicator light in the switch turns off.) This starts an LMU switch.
Messages appear on the console that indicate the changing status of the LMUs.
3. Make sure that the MASTER indicator turns on as the standby LMU becomes the
new master LMU.
A message appears if the standby LMU successfully assumes the role of master LMU.
All LSMs go through quick-init and recovery procedures.
All LMU requests except enter requests are re-driven. You must restart enter
operations.
Note: Enter operations end when a master LMU is powered off. Other LMU and

Powering Off the Standby LMU

No special precautions are necessary to power-off the standby LMU; just press the DC
power switch on the standby LMU operator panel. Messages appear on the console that
indicate which LMU is the master LMU and the changing status of the standby LMU.
Powering Off an LMU—Emergency
To power-off the LMU in an emergency, press the
panel. Call a service representative to restore power to an LMU that has been powered
down by the
9206
robotics operations recover and complete once the standby LMU becomes the
new master LMU.
switch.
EPO
Eleventh Edition
3-64. Upon receiving the LMU ready signal, the
switch on the LMU operator
EPO
LMU Operation
"Performing
3-65