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Chapter 3. RAS and manageability 83
internal LED diagnostics that identify the parts that require service. Attenuation of the error is
provided through a series of light attention signals, starting on the exterior of the system
(System Attention LED) which is located on the front of the system and ending with an LED
near the failing Field Replaceable Unit.
For more information about Client Replaceable Units, including videos, see:
http://publib.boulder.ibm.com/eserver
System attention LED
The attention indicator is represented externally by an amber LED on the operator panel and
on the back of the system unit. The amber LED indicates that the system is in one of the
following states:
Normal state, LED is off.
Fault state, LED is on solid.
Identify state, LED is blinking.
Additional LEDs on I/O components such as PCI-X slots and disk drives provide status
information such as power, hot-swap, and need for service.
Concurrent maintenance
Concurrent Maintenance provides replacement of the following parts while the system
remains running:
Disk drives
Cooling fans
Power subsystems
PCI-X adapter cards
Operator Panel (requires HMC-guided support)
GX RIO-2/HSL-2 Adapter (FC 2888)
– All PCI-X adapters connected to the involved RIO loop must be first varied offline from
the operating system.
– This concurrent maintenance task requires HMC-guided support.
3.2 Manageability
We describe the functions and tools provided for IBM System p5 servers to ease
management in the next sections.
3.2.1 Service processor
The service processor (SP) is always working. CEC can be in the following states:
Power standby mode (power off)
Operating, ready to start partitions
Operating with some partitions running and an AIX 5L or Linux system in control of the
machine.
The SP is still working and checking the system for errors, ensuring the connection to the
HMC (if present) for manageability purposes and accepting Advanced System Management
Interface (ASMI) SSL network connections. The SP provides the capability to view and