D–2 Model 2100 and 2200 Ultra SCSI Controller Enclosures User Guide
■
For clarity, the valid alphabetical characters displayed are as follows:
❏
A
,
C
,
E
,
F
,
G
(displayed as
),
H
,
J
,
L
,
P
, and
U
❏
b
,
d
,
h
,
i
,
n
,
o
,
r
,
t
(displayed as
), and
y
(displayed as
)
Alarms
Error alarms can be categorized as either fatal (EMU reset required) or nonfatal (user
interaction required).
Fatal Error Alarms
Detection of a fatal alarm means that the EMU is not operating properly. The EMU
attempts to clear the error by resetting itself.
NOTE:
Resetting of the EMU does not impact data storage functionality.
Whenever an EMU failure is detected, the following occurs:
■
FE
is displayed on the alphanumeric display
■
The audible alarm sounds a 2-second steady tone and then three to five beeps
■
The EMU resets
■
00
is displayed on the alphanumeric display after the EMU resumes normal operations
Nonfatal Error Alarms
The EMU monitors enclosure and element operations and alerts the user to various error
conditions that might impact enclosure functionality. Each nonfatal error condition is
assigned an alarm severity level of either unrecoverable, critical, noncritical, or
informational.
Two things determine the error condition display sequence: the alarm severity and order of
occurrence by time. For example, all unrecoverable alarms are displayed before any other
alarm. When there are no unrecoverable alarms, critical error alarms have priority. Each
succeeding alarm level has priority over the lower levels, but only if no active, higher-level
alarms exist.
