Symptom

Cause

 

Action

 

 

 

 

If the ambient air is cool

The first stage in the thermal

1

Check the installation for any

(below 25 °C) and the fans

control process is for the fans

 

airflow restrictions at either the

are observed to increase in

to automatically increase in

 

front or rear of the enclosure. A

speed, then some restriction

speed when a thermal

 

minimum gap of 25mm at the front

on airflow may be causing

threshold is reached. This

 

and 50mm at the rear is

additional internal

may be caused by higher

 

recommended.

temperature rise.

ambient temperatures in the

2

 

Note: This is not a fault

local environment and may

Check for restrictions due to dust

be perfectly normal.

 

build-up; clean as appropriate.

condition.

Note: This threshold

3

 

 

Check for excessive re-circulation

 

changes according to the

 

of heated air from rear to the front.

 

number of drives and PCMs

 

Use in a fully enclosed rack

 

fitted.

 

installation is not recommended.

 

 

4 Check that all Blank modules are in

 

 

 

place.

 

 

5

Reduce the ambient temperature.

 

 

 

 

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APC 15000 RAID manual Symptom Cause Action