B
IPMI Commands and Managed Sensors
95
Managed sensors
On
the
CPM,
the
IPMC
sensors
monitor
voltages,
temperatures,
control
signals,
and
status
events.
For
functional
information,
refer
to
IPMI
controller
on
page 33.
The
sensors
are
described
in
Table 38
.
Types of sensors
The
CPM
implements
the
following
types
of
sensors.
•
Discrete
—
A
discrete
sensor
can
have
up
to
16
bitmapped
states,
with
one
state
as
true.
•
Digital
—
A
digital
sensor
has
two
possible
states,
only
one
of
which
can
be
active
at
any
given
time.
For
example,
a
digital
sensor
monitoring
the
power
may
indicate
whether
the
power
is
good
or
not
good.
•
OEM
—
An
OEM
sensor
has
its
states
defined
by
the
manufacturer.
The
reading
types
of
these
sensors
are
sometimes
defined
as
“sensor
‐
specific.”
•
Threshold
—
A
threshold
sensor
has
a
range
of
256
values,
which
represent
measurements
on
the
CPM
and
its
FRUs.
Temperature,
voltage,
current,
and
fan
speed
sensors
are
examples
of
threshold
sensors.
Table 37
lists
the
possible
threshold
types
for
the
managed
sensors.
Note:
If
the
CPM
exceeds
one
of
the
UNR
thresholds,
the
Shelf
Manager
generates
a
critical
alarm
and
shuts
down
the
CPM.
See
the
Software
Guide
for
details.
Table 37. Threshold types
Threshold type Description
UNR
Upper non-recoverable thresholds generate a critical alarm on the high side.
UC
Upper critical thresholds generate a major alarm on the high side.
UNC
Upper non-critical thresholds generate a minor alarm on the high side.
LNC
Lower non-critical thresholds generate a minor alarm on the low side.
LC
Lower critical thresholds generate a major alarm on the low side.
LNR
Lower non-recoverable thresholds typically generate a critical alarm on the low side.
