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4-1
CHAPTER
4
FRU Replacement Preparation
This chapter describes how to prepare a field-replaceable unit (FRU) for safe
replacement. The information is organized into the following topics:
■ “FRU Replacement Method” on page 4-1
■ “Active Replacement” on page 4-4
■ “Hot Replacement” on page 4-6
■ “Cold Replacement (Powering the Server Off and On)” on page 4-12
4.1 FRU Replacement Method
There are three basic methods for replacing the FRUs:
Active replacement – To replace a FRU while the domain, to which the FRU belongs,
continues running. Active replacement requires that the FRU be inactivated or
powered down using either an XSCF command or Solaris OS command. 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 isolating the hard disk drive from the Solaris OS varies
depending on whether disk mirroring software or other support software is used.
For details, see the relevant software manuals.
Hot replacement –To replace a FRU while the domains are powered off. Depending
on the FRU to be replaced, the FRU can either be directly replaced or be inactivated
or powered down using an XSCF command.
Cold replacement – To replace a FRU while all domains are stopped and the server
is powered off and unplugged.