36
SPARC Enterprise T2000 Server Administration Guide • April 2007
degraded boot when a subsystem failure is detected. Both the
auto-boot?
and
auto-boot-on-error?
switches must be set to
true
to enable an automatic
degraded boot. To set the switches, type:
Note –
The default setting for
auto-boot-on-error?
is
false
. The system will
not attempt a degraded boot unless you change this setting to
true
. In addition, the
system will not attempt a degraded boot in response to any fatal nonrecoverable
error, even if degraded booting is enabled. For examples of fatal nonrecoverable
errors, see
“Error Handling Summary” on page 36
.
Error Handling Summary
Error handling during the power-on sequence falls into one of the following three
cases:
■
If no errors are detected by POST or OpenBoot firmware, the system attempts to
boot if
auto-boot?
is
true
.
■
If only nonfatal errors are detected by POST or OpenBoot firmware, the system
attempts to boot if
auto-boot?
is
true
and
auto-boot-on-error?
is
true
.
Nonfatal errors include the following:
■
SAS subsystem failure. In this case, a working alternate path to the boot disk is
required. For more information, see
“Multipathing Software” on page 42
■
Ethernet interface failure.
■
USB interface failure.
■
Serial interface failure.
■
PCI card failure.
■
Memory failure. Given a failed DIMM, the firmware will unconfigure the entire
logical bank associated with the failed module. Another nonfailing logical
bank must be present in the system for the system to attempt a degraded boot.
Note –
If POST or OpenBoot firmware detects a nonfatal error associated with the
normal boot device, the OpenBoot firmware automatically unconfigures the failed
device and tries the next-in-line boot device, as specified by the
boot-device
configuration variable.
ok
setenv auto-boot? true
ok
setenv auto-boot-on-error? true
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