User Manual - A3661-90001

5-74 High Availability Array Monitor (HARAYMON)
Note It is important to be aware of the distinction between the occurrence of a failure and the
reporting of that failure.
A disk array component failure is reported immediately to the disk array. The disk array,
in turn, notifies the system of this event
when the next I/O is attempted to any disk array
component
. It is important to recognize the following:
• The next I/O
may or may not occur soon after the failure occurs.
• The component on which the I/O is being attempted at that time
may or may not be the failing component.
• In a multi-host configuration, the system attempting the next I/O
may or may not be the system that was using the disk array
before or during the failure.
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Note Always check that the FAULT, REPLACE, or SERVICE LED on a suspected failing
module is lit before removing it.
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