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4-4 Compaq TA1000 Tape Drive Array Reference Guide
Power Supplies and Blowers
Status Reporting
On
The green LED on the power supply assembly is On when both the power
supply and the blower are operational. When there is either a power supply or
blower fault, the EMU turns Off both the green power supply and the
enclosure power LEDs. See Chapter 6, "Enclosure Power and Cooling," for a
description of the operation of the power supply LED.
The green EMU status displays the EMU status and identifies the drive types,
either LVD or single-ended. This LED flashes at two different rates (see
Figure 4-4).
On
Off
On
Figure 4-4. EMU LED display
I
During normal operation it flashes at a rate of approximately once per
second. This is the "heartbeat." The EMU and Enclosure LED on the
front of the enclosure (see Figure 4-3) display is identical.
I
When a single-ended drive is installed in the enclosure the LED is "on"
twice per second.
Heartbeat
Off
Single-Ended Drive Installed
Off
On
On
Off
On
Off
Off
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