Instruction Manual

A CRITICAL condition has precedence over NON CRITICAL and INFORMATION conditions, but does not
have precedence over UN RECOVERABLE conditions.
When this codition is the most severe active condition, the audible alarm sounds three times per alarm
cycle, as shown in Table 20.
NONCRITICAL condition
ANONCRITICALconditionislessseverethananUNRECOVERABLEconditionoraCRITICALcondition.
This condition
occurswhenoneormoreelementsinsidetheenclosurehavefailedorareoperating
outside of the
ir specifications. The failure of these elements do not affect continued normal operation
oftheenclosure. Alldevicesintheenclosurecontinuetooperateaccordingtotheirspecifications. The
ability of the devices to operate correctly may be reduced should other errors occur.
Early corre ction to prevent system degradation is recommended.
A NONCRITICAL condition establishes the following cond itions:
• An UNRECOVER
ABLE condition h as precedence over this condition.
• A CRITICAL condition has precedence over this condition.
• This condition has precedence over INFORMATION condition.
• When this co
ndition is the most severe error active, the audible alarm sounds two times per
alarm cycle, as shown in Table 20.
INFORMATION condition
An INFORMATION condition is the least severe of the c ondition reports and does not require imm ediate
correction. It advises you that a condition exists that does not reduce the capability of an element but
thatcouldbecomemoresevereandrequirecorrectiveactionlater.
When only an INFORMATION condition is active, the audible alarm sounds once per alarm cycle,
as shown in Table 20.
Error queue
The E M U stores each condition report in the error queue until the problem is corrected, or for at least 15
seconds af
ter the error is reported. This ensures that when there are multiple errors or a recurring error,
each can be
displayed. The complete repor t is stored and you recall any report using a combination of
the top an
d bottom push-buttons. Correcting the error removes the condition report from the error queue.
Each report in the queue contains the element t ype, the element number, and the error code. To remove
information from this queue requires either clearing the error or replacing the EMU.
The EMU displays the error qu eue information based on severity level and time of occurrence.
NOTE:
When you a
reviewinganerror,theoccurrenceofamoresevereerrortakesprecedenceandthedisplay
changes to the most severe error.
The most severe error in the queue always has precedence, regardless of how long less severe errors
have been in the queue.
This hierarchical display ensures that the most severe errors haveprecedence over less severe errors. The
earliest reported condition within an error type has precedence over err ors reported later. For example ,
if you have errors at a ll levels, the EMU d isplays them as follows:
1. UNRECOVERABLE errors in the sequence they occurred.
2. CRITICAL errors in the sequence they occurred.
3. NONC RITICAL errors in the sequence they occurred.
4. INFORMATION conditions in the sequence they occurred.
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Storage system hardware components