Sun Microsystems Netra CT 410, Service Manual

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Chapter 1 Preparing for FRU Installation and Replacement 1-3
FIGURE 1-1
Attaching the Antistatic Wrist Strap
1.3 FRU Categories
In general, the FRUs in a Netra CT server can be divided into two categories:
■
Hot-installable/replaceable (referred to hereafter as hot-swappable ), meaning that
you can install or remove and replace the FRU while the server is running,
without interrupting the operation of the server. This category of FRU sometimes
requires that you enter hot-swap software commands before and after an
installation or a removal/replacement to incorporate the new FRU in the system
correctly. For information on hot-swap commands, see
Chapter 5 .
■
Non-hot-swappable, or cold-swappable , meaning that you must halt (and, in some
cases, also power off) the server before installing or removing and replacing a
FRU. Note that you must halt power only to the server where you would be
removing and replacing the FRUs; any other servers installed in the same chassis
can remain running.
Redundant power supplies and hard drives in a Netra CT 810 server are a variation
of the hot-swappable category. You can replace a single power supply in a
redundant configuration while the server is running, without having to enter any
software commands, or a single hard drive after you have unmounted the drive or
disengaged it if you are running a disk management software package.
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