Displaying Dual Lmu Status; Lmu Switch Overview - StorageTek 4410 Hardware Operator's Manual

1. Load the functional diskettes into the top diskette drives for both LMUs. See
"Functional Diskettes" on page 3-68
diskette.
Notes:
a. You must load both LMUs with the same version of LMU firmware.
b. The correct hardware configuration must be on each LMU diskette.
2. Press the power switch on the operator panel of one LMU. (On older models, press
the switch to the "|" position; the indicator in the switch turns on. If it does not, call
a service representative to restore power.) Upon IPL completion, the MASTER
indicator turns on.
3. Power-on the second LMU by repeating step
LMU. The MASTER indicator light blinks briefly on the standby LMU as it polls the
master LMU to make sure that it is working.
If both LMUs power-on successfully, the console message shows that the dual LMUs are
configured, which LMU is master, and that the standby is ready.
Note: If a series of highlighted messages appear, indicating first one LMU, then the

Displaying Dual LMU Status

To determine the status of the dual LMU, enter a command to display the ACS status.
The command response lists:
• Current status of the ACS
• Current status of the dual LMU configuration
• Master LMU
• Standby LMU
• online, offline or standby status of each dual LMU station
• Software/LMU compatibility levels

LMU Switch Overview

The master LMU functionality is switched in these ways:
• The switch is automatic due to a self-detected failure or power supply problem in the
master LMU.
• You start the switch operation.
• The
• The master LMU is powered off.
9206
other is master, refer to the software manual for dual LMU recovery procedures.
switch on the master LMU is pressed.
IPL
Eleventh Edition
for instructions on loading a functional
2 on the operator panel of the second
LMU Operation
3-63