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Chapter 2. Diagnostics
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Chapter 2. Diagnostics
Use the available diagnostic tools to help solve any problems that might occur in the blade
server.
The first and most crucial component of a solid serviceability strategy is the ability to
accurately and effectively detect errors when they occur. While not all errors are a threat to
system availability, those that go undetected are dangerous because the system does not
have the opportunity to evaluate and act if necessary.
POWER6™ processor-based systems are specifically designed with error-detection
mechanisms that extend from processor cores and memory to power supplies and hard
drives.
POWER6™ processor-based systems contain specialized hardware detection circuitry for
detecting erroneous hardware operations. Error checking hardware ranges from parity
error detection coupled with processor instruction retry and bus retry, to ECC correction on
caches and system buses.
Hardware error checkers have these distinct attributes:
•
Continuous monitoring of system operations to detect potential calculation errors
• Attempted isolation of physical faults based on runtime detection of each unique failure
•
Initiation of a wide variety of recovery mechanisms designed to correct a problem
POWER6™ processor-based systems include extensive hardware and firmware recovery
logic.
Machine check handling
Machine checks are handled by firmware. When a machine check occurs, the firmware
analyzes the error to identify the failing device and creates an error log entry.
If the system degrades to the point that the service processor cannot reach standby state,
the ability to analyze the error does not exist. If the error occurs during POWER®
hypervisor (PHYP) activities, the PHYP initiates a system reboot.
In partitioned mode, an error that occurs during partition activity is surfaced to the
operating system in the partition.
What to do if you cannot solve a problem
If you cannot locate and correct the problem using the diagnostics tools and information,
see Appendix A. Getting help and technical assistance.