IBM JS20 Hardware Maintenance Manual - Page 18

Frequency, throttling, process, active., idling.

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2. BladeCenter JS20 models that are designed for the NEBS environment contain a power-management capability that provides the maximum possible operating time for your system. Power management is invoked only when the blade server is installed in a BladeCenter T unit and only under the short term extended thermal conditions that are described in the preceding table as "short term" in the high end of the NEBS extended temperature range, 40° to 55°C (104° to 131°F). Instead of shutting down or failing in short term extended thermal conditions, the JS20 blade server automatically reduces the frequency of the processor to maintain acceptable thermal levels. The processor frequency automatically returns to normal as thermal conditions improve. The BladeCenter management module is notified when power management starts and again when it stops. The following entries are made in the event log: v Frequency throttling process is now active. (This message indicates that power reduction is in effect.) v Frequency throttling process is now idling. (This message indicates that power reduction was previously invoked but is no longer in effect.) Do not restart the blade server when power reduction is in effect. 3. Some applications are sensitive to processor frequency changes. Check with your application vendors to determine if there are any possible impacts to your applications from the effects of the JS20 blade server power-management capability in the short term extended thermal conditions of the NEBS environment. 8 BladeCenter JS20 Type 8842: Hardware Maintenance Manual and Troubleshooting Guide

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2.
BladeCenter
JS20
models
that
are
designed
for
the
NEBS
environment
contain
a
power-management
capability
that
provides
the
maximum
possible
operating
time
for
your
system.
Power
management
is
invoked
only
when
the
blade
server
is
installed
in
a
BladeCenter
T
unit
and
only
under
the
short
term
extended
thermal
conditions
that
are
described
in
the
preceding
table
as
"short
term"
in
the
high
end
of
the
NEBS
extended
temperature
range,
40°
to
55°C
(104°
to
131°F).
Instead
of
shutting
down
or
failing
in
short
term
extended
thermal
conditions,
the
JS20
blade
server
automatically
reduces
the
frequency
of
the
processor
to
maintain
acceptable
thermal
levels.
The
processor
frequency
automatically
returns
to
normal
as
thermal
conditions
improve.
The
BladeCenter
management
module
is
notified
when
power
management
starts
and
again
when
it
stops.
The
following
entries
are
made
in
the
event
log:
v
Frequency
throttling
process
is
now
active.
(This
message
indicates
that
power
reduction
is
in
effect.)
v
Frequency
throttling
process
is
now
idling.
(This
message
indicates
that
power
reduction
was
previously
invoked
but
is
no
longer
in
effect.)
Do
not
restart
the
blade
server
when
power
reduction
is
in
effect.
3.
Some
applications
are
sensitive
to
processor
frequency
changes.
Check
with
your
application
vendors
to
determine
if
there
are
any
possible
impacts
to
your
applications
from
the
effects
of
the
JS20
blade
server
power-management
capability
in
the
short
term
extended
thermal
conditions
of
the
NEBS
environment.
8
BladeCenter
JS20
Type
8842:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide