Lmu Operation; Operating An Lmu-Stand-Alone Configuration; Powering On/Ipling An Lmu; Displaying Lmu Status - StorageTek 4410 Hardware Operator's Manual

LMU Operation

The LMU responds to mount and dismount requests from the host through the library
software and passes each request to the desired LSM, which performs the physical action
requested. The following pages describe your procedures for stand-alone LMU and dual
LMU configurations. Emergency power off procedures are the same for both
configurations.
See Chapter 2, "Controls and Indicators,"
to the appropriate software manual for the command syntax and console messages.
Operating an LMU—Stand-alone Configuration
The following sections describe how to operate a stand-alone LMU.

Powering On/IPLing an LMU

To power on a stand-alone LMU:
• Press the power switch on the LMU operator panel. (On older models, press the
switch to the "|" position; the indicator in the switch lights. If it does not, call a
service representative to restore power.)

Displaying LMU Status

Type the appropriate command to display LMU status. The command lists:
• Current status of the ACS
• Current status of the LMU
• Online, offline or standby status of each LMU station

Powering Off an LMU

To power off a stand-alone LMU:
1. Place all stations offline to all software.
Note: Leaving stations online when you power off an LMU causes I/O error
2. Press the power switch on the LMU operator panel. (On older models, press to "0";
the indicator light in the switch turns off).
Note: In a dual LMU environment, powering off the master LMU starts an LMU
9206
messages to appear on the console.
switch that causes the standby LMU to become the master LMU. See
an LMU—Dual LMU Configuration" on page 3-62
Eleventh Edition
for explanations of LMU control panels. Refer
for more information.
LMU Operation
"Operating
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