Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

Page: 69 / 186

Environmental Monitoring Unit (EMU)
UltraSCSI RAID Enclosure 3–15
The EMU processes two types of problems:
•
An error condition involving the failure of a component or conditions
outside the predetermined environment, such as an overtemperature
condition.
When there is an error condition the system fault LED is O
N
. For
detailed information about system fault LEDs, see “Error Condition
Reporting,” on page 3–17.
•
A fault condition involves a subsystem configuration problem, such as
a Boot ROM checksum failure.
When there is a fault condition the system fault LED is F
LASHING
. For
detailed information about the system fault LED, see “Configuration
Fault Code Reporting.”
Whenever the audible alarm sounds, the user should check the EMU status
LEDs to determine the problem.
___________________ Caution _____________________
Should the audible alarm sound but the status LEDs not indicate
an error condition, it is possible that the error condition no
longer exists. However, you should always check the error log
on the maintenance terminal to ensure that the error no longer
exists.
________________________________________________
The EMU reports the system status, to include error conditions, to the array
controller that records some of this information in the error log and displays
it on the controller console.
Alarm Control Switch
Whenever a power, environment, blower error, or fault condition occurs the
EMU turns on the local audible alarm. At the same time the alarm sounds,
an amber LED in the alarm control switch turns O
N
. The alarm remains on
until one of the following conditions occurs:
•
Correction of the error condition
•
The user momentarily presses the alarm control switch
When you momentarily press the switch you turn off the audible alarm for
all current fault conditions in the local subsystem. The alarm remains O
FF
until one of the following conditions occur: