Chapter 5: System Monitoring and Alarms
60
Interpreting Sensor Events
The ATCA specification includes the following definitions for the sensor event severity levels:
•
IPMI non-critical / PICMG 3.0 minor / telco minor – a warning that things are somewhat out of normal
range, but not really a “problem” yet. See
below.
•
IPMI critical / PICMG 3.0 major / telco major – things are still in valid operating range, but are getting
close to the edge; unit still operating within vendor-specified tolerances. See
below.
•
IPMI non-recoverable / PICMG 3.0 critical / telco critical – unit no longer operating within vendor-
specified tolerances. See
below.
Non-Critical Events
Non-critical events are informative only. They do not indicate that the module is outside of its
operating limits. In general, no action is required. However, in certain contexts, system or shelf
management software may decide that preventive action should be taken. For example, if
several modules in a shelf report upper non-critical temperature events, the shelf manager
might decide to increase fan speed.
Critical Events
Critical events indicate that the module is still within its operating limits, but it is close to
exceeding one of those limits. Possible action in this case is to closely monitor the alarming
sensor and take more aggressive action if it approaches the non-recoverable threshold.
Non-Recoverable Events
Non-recoverable events indicate that the module may no longer be functioning because it is
now outside of its operating limits. It is likely that action is required or has already been taken
by the local hardware/firmware. For example, a processor may have shut itself down because
its maximum die temperature was exceeded, or a shelf manager may decide to deactivate the
module because the processor is too hot.
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