Chapter 6 Configuring System Firmware 109
Note – You can obtain environmental status at any time, regardless of whether
OpenBoot environmental monitoring is enabled. The .env status command simply
reports the current environmental status information; it does not take action if
anything is abnormal or out of range.
About Automatic System Recovery
To some, automatic system recovery (ASR) implies an ability to shield the operating
system in the event of a hardware failure, allowing the operating system to remain
up and running. The implementation of ASR on the Sun Fire V890 server is different.
ASR on the Sun Fire V890 server provides for automatic fault isolation and
restoration of the operating system following non-fatal faults or failures of these
hardware components:
â– Processors
â– Memory modules
â– PCI buses and cards
â– IDE bus
â– FC-AL subsystem
â– Fast Ethernet interface
â– Gigabit Ethernet interface
â– USB interface
â– Serial interfaces
In the event of such a hardware failure, firmware-based diagnostic tests isolate the
problem and mark the device (using the 1275 Client Interface, via the device tree) as
either failed or disabled. The OpenBoot firmware then deconfigures the failed device
and reboots the operating system. This all occurs automatically, as long as the Sun
Fire V890 system is capable of functioning without the failed component.
Once restored, the operating system will not attempt to access any deconfigured
device. This prevents a faulty hardware component from keeping the entire system
down or causing the system to crash repeatedly.
As long as the failed component is electrically dormant (that is, it does not cause
random bus errors or introduce noise into signal lines), the system reboots
automatically and resumes operation. Be sure to contact a qualified service
technician about replacing the failed component.
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