Automatic System Recovery - Sun Microsystems Fire V210 Administration Manual

6.11

Automatic System Recovery

Note – Automatic System Recovery (ASR) is not the same as Automatic Server
Restart, which the Sun Fire V210 and V240 servers also support. For additional
information about Automatic Server Restart see
Restart" on page
Automatic System Recovery (ASR) consists of self-test features and an auto-
configuring capability to detect failed hardware components and unconfigure them.
By doing this, the server is able to resume operating after certain non-fatal hardware
faults or failures have occurred.
If a component is one that is monitored by ASR, and the server is capable of
operating without it, the server automatically reboots if that component develops a
fault or fails.
ASR monitors memory modules:
Memory modules
■
If a fault is detected during the power-on sequence, the faulty component is
disabled. If the system remains capable of functioning, the boot sequence continues.
If a fault occurs on a running server, and it is possible for the server to run without
the failed component, the server automatically reboots. This prevents a faulty
hardware component from keeping the entire system down or causing the system to
crash repeatedly.
To support degraded boot capability, OpenBoot firmware uses the 1275 Client
interface (via the device tree) to mark a device as either failed or disabled. This creats
an appropriate status property in the device tree node. The Solaris OS does not
activate a driver for any subsystem so marked.
As long as a failed component is electrically dormant (not causing random bus
errors or signal noise, for example), the system reboots automatically and resumes
operation while a service call is made.
Note – ASR is not enabled until you activate it.
6-30 Sun Fire V210 and V240 Servers Administration Guide • December 2005
3-4.
Section 3.1.3, "Automatic Server