up to 128 GB of system memory. For the official list of supported DIMMs, see
the ServerProven
®
Web site at http://www.ibm.com/servers/eserver/
v
Light path diagnostics
Light path diagnostics provides light-emitting diodes (LEDs) to help you
diagnose problems. An LED on the blade server control panel is lit if an unusual
condition or a problem occurs. If this happens, you can look at the LEDs on the
system board to locate the source of the problem.
For more information, see the online information or the
Problem Determination
and Service Guide
.
v
Power throttling
If your BladeCenter unit supports power management, the power consumption
of the blade server can be dynamically managed through the management
module. For more information, see the online management-module
documentation or the IBM support site at http://www.ibm.com/systems/
support/.
Reliability, availability, and serviceability features
Three of the most important features in server design are reliability, availability,
and serviceability (RAS). The reliability of the BladeCenter JS23 and the JS43 blade
servers starts with components, devices, and subsystems that are fault tolerant.
Reliability, availability, and serviceability protect the integrity of the data that is
stored in the blade server, maintain the availability of the blade server when you
need it, and enhance the ease with which you can diagnose and correct problems.
Component-level RAS features
The blade server has the following component-level RAS features:
v
Alternate processor recovery
v
Bit steering
v
Chipkill
™
memory for dual inline memory modules (DIMMs)
v
Diagnostic support of Ethernet controllers
v
Dual inline memory module (DIMM) failure isolation
– DIMM pair identification through unrecoverable error (UE) checkpointing and
message-related recovery actions
– Single DIMM identification through recoverable component error (CE)
checkpointing and garding
v
Dynamic deallocation (runtime POWER6 garding of microprocessor and
memory)
v
L2 cache line delete
v
Memory chip kill - Chipkill memory for DIMMs
v
Memory Predictive Failure Analysis (PFA) alerts through scrubbing and
error-checking and correction (ECC)
v
Memory scrubbing
v
Peripheral component interconnect (PCI) bus parity, ECRC, and surprise link
down
v
PFA thresholding of correctable hardware errors of the microprocessors and L2
cache
v
Processor runtime diagnostics (PRD) that initiates the following actions to
recover from errors:
– Self-healing, such as redundant bit steering for memory
– Deallocation at runtime of a failing resource, such as a processor core, a
memory page
Chapter 1. Product overview
9
Summary of Contents for BladeCenter JS23
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