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4-2 SPARC Enterprise M8000/M9000 Servers Service Manual • June 2010
■ Section 4.6, “Emergency Switch-Off” on page 4-34
4.1 Types of Replacement Procedures
4.1.1 FRU Replacement
The three types of replacement procedures explained below are supported for FRU
replacement. Choose the most suitable replacement procedure according to the
customer's system environment.
■ Active replacement
A target FRU is operated while the Solaris OS of the domain to which the FRU
belongs is operating. The target FRU is operated by using Solaris OS commands or
XSCF commands. Because the power supply unit (PSU) and fan unit (FAN) do not
belong to any domain, they are operated by using XSCF commands regardless of the
operating state of the Solaris OS.
Note – The procedure for disconnecting a hard disk drive from the domain depends
on whether disk mirroring software or similar support software is active. For
details, see the related individual software manuals.
■ Hot replacement
A target FRU is operated while the domain to which the FRU belongs is stopped.
Depending on the target FRU, there are two cases as follows:
■ Operated with XSCF commands.
■ Operated directly, not by using XSCF commands.
■ Cold replacement
After all the domains are stopped and then the server is powered off, a FRU is
operated.
Note – Do not operate a target FRU while the OpenBoot PROM is running (the ok
prompt is displayed). After stopping the relevant domain (power-off) or starting the
Solaris OS, operate the target FRU.