Sun Microsystems Fire 880, Руководство пользователя

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Chapter 6 Configuring System Firmware 127
Auto-Boot Options
The OpenBoot firmware provides an NVRAM controlled switch 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, then
auto-boot?
is ignored and
the system does not boot unless an operator boots the system manually. This
behavior is obviously not acceptable for a degraded boot scenario. Therefore, the
Sun Fire 880 OpenBoot firmware provides a second NVRAM-controlled switch
called
auto-boot-on-error?
. This switch 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.
Note – The default setting for
auto-boot-on-error?
is
false
. Therefore, 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
non-recoverable error, even if degraded booting is enabled. For examples of fatal
non-recoverable errors, see “Error Handling Summary” on page 127.
Error Handling Summary
Error handling during the power-on sequence falls into one of the following three
cases:
1. If no errors are detected by POST or OpenBoot Diagnostics, the system attempts
to boot if
auto-boot?
is
true
.
2. If only non-fatal errors are detected by POST and/or OpenBoot Diagnostics, the
system attempts to boot if
auto-boot?
is
true
and
auto-boot-on-error?
is
true
. Non-fatal errors include the following:
■
SCSI bus failure
■
FC-AL subsystem failure – In this case, a working alternate path to the boot
disk is required. For more information, see “About Multipathing Software” on
page 148.
■
Gigabit Ethernet or Fast Ethernet interface failure
■
USB interface failure
ok setenv auto-boot? true
ok setenv auto-boot-on-error? true