Sun Microsystems Sun Fire V215, Руководство администратора

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36 Sun Fire V215 and V245 Servers Administration Guide • September 2006
Autoboot Options
The system firmware stores a configuration variable called
auto-boot?
, which
controls whether the firmware will automatically boot the operating system after
each reset. The default setting for Sun platforms is
true
.
Normally, if a system fails power-on diagnostics,
auto-boot?
is ignored and the
system does not boot unless an operator boots the system manually. An automatic
boot is not acceptable for booting a system in a degraded state. Therefore, the Sun
Fire server OpenBoot firmware provides a second setting,
auto-boot-on-error?
.
This setting controls whether the system will attempt a 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
true
. Therefore, the
system attempts a degraded boot unless you change this setting to
false
. 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 38 .
■
Ethernet interface failure.
■
USB interface failure.
■
Serial interface failure.
■
PCI card failure.
ok setenv auto-boot? true
ok setenv auto-boot-on-error? true