Reference For Estimating System Boot Time (To The Ok Prompt) - Sun Microsystems Sun Fire V445 Server Administration Manual

Reference for Estimating System Boot Time (to the
ok Prompt)
Note – The standard (default) configuration does not increase system boot time
after a reset that is initiated by user commands from OpenBoot (reset-all or
boot) or from Solaris (reboot, shutdown, or init).
The measurement of system boot time begins when you power on (or reset) the
system and ends when the OpenBoot ok prompt appears. During the boot time
period, the firmware executes diagnostics (POST and OpenBoot Diagnostics) and
performs OpenBoot initialization. The time required to run OpenBoot Diagnostics
and to perform OpenBoot setup, configuration, and initialization is generally similar
for all systems, depending on the number of I/O cards installed when
diag-script is set to all. However, at the default settings (diag-level = max
and verbosity = normal), POST executes extensive memory tests, which will
increase system boot time.
System boot time will vary from system-to-system, depending on the configuration
of system memory and the number of CPUs:
Because each CPU tests its associated memory and POST performs the memory
tests simultaneously, memory test time will depend on the amount of memory on
the most populated CPU.
Because the competition for system resources makes CPU testing a less linear
process than memory testing, CPU test time will depend on the number of CPUs.
168 Sun Fire V445 Server Administration Guide • September 2007