6-4 Sun Fire V210 and V240 Servers Administration Guide • December 2005
■ ALOM continues to be effective when the server operating system goes off-line.
See TABLE 3-1 for a list of the components monitored by ALOM and the information
it provides for each.
Tip – For additional information see the Advanced Lights Out Management User’s
Guide (817-5481).
6.4 POST Diagnostics
POST is a firmware program that is useful in determining if a portion of the system
has failed. POST verifies the core functionality of the system, including the CPU
module or modules, motherboard, memory, and some on-board I/O devices. POST
generates messages that can be useful in determining the nature of a hardware
failure. POST can be run even if the system is unable to boot.
POST detects most system faults and is located in the motherboard OpenBoot™
PROM. POST can be set to run by the OpenBoot firmware at power up by setting
two environment variables, the diag-switch? and the diag-level flag, which are
stored on the system configuration card.
POST runs automatically when the system power is applied and all of the following
conditions apply:
■ diag-switch? is set to true (default is false)
■ diag-level is set to min, max or menus (default is min)
POST also runs automatically when the system is reset and all of the following
conditions apply:
■ diag-switch? is set to false (default is false)
■ the current type of system reset matches any of the reset types set in post-trigger
■ diag-level is set to min, max or menus (default is min)
If diag-level is set to min or max, POST performs an abbreviated or extended test,
respectively.
If diag-level is set to menus, a menu of all the tests executed at power up is
displayed.
POST diagnostic and error message reports are displayed on a console.
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