IBM DS4000 EXP810, Installation, User'S, And Maintenance Manual

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Table 32. The dc power supply and fan unit LEDs
Number LED Normal Status Problem Status
1
1
The dc power supply and
fan unit power On Off
2 Service Action Allowed
(OK to Remove) Off On
2
3 Service Action Required
(Fault) Off On
2
4
1
Direct Current Enabled On Off
Notes:
1. Although the symbols for dc power supply and fan unit power and Direct Current Enabled
LEDs are the same, the LEDs serve different purposes. The dc power supply and fan unit
power LED indicates that dc inputs to the dc power supply and fan unit are present and
good. The Direct Current Enabled LED indicates that the dc output from the dc power
supply and fan unit to the internal circuitry is good.
2. Verify that any attached disconnect device is set to On and the power switch is in the On
position when these LEDs are lit. If the disconnect device switch is at the On position, flip
it to the Off position, wait at least 15 seconds and flip it again to the On position. If these
LEDs did not change to an unlit state in 30 seconds, replace the dc power supply and fan
unit CRU.
Front LEDs
This section describes the primary LEDs and controls on the front of the storage
expansion enclosure for all models. The front view shows the following components:
v
Front Frame - Metal cage frame containing global indicator lights and a link rate
switch.
v Drives - Up to 16 removable drives, which are numbered 1 through 16 from left
to right. When a drive is installed, the drive and tray slot designation is set
automatically. The hardware addresses are based on the enclosure ID setting on
the ESM and on the drive’s physical location in the storage expansion enclosure.
Note: The drives in your storage expansion enclosure might differ slightly in
appearance from those shown. The variation does not affect the function
of the drives.
Chapter 4. Operating the EXP810
75