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26 Sun Fire V490 Server Administration Guide • August 2004
About Hot-Pluggable and Hot-
Swappable Components
In a Sun Fire V490 system, the FC-AL disk drives are hot-pluggable components and
the power supplies are hot-swappable. (No other component of the system is either
hot-pluggable or hot-swappable.) Hot-pluggable components are those that you can
install or remove while the system is running, without affecting the rest of the
system’s capabilities. However, in many cases, you must prepare the operating
system prior to the hot-plug event by performing certain system administration
tasks. The power supplies require no such preparation and are called hot-swappable
components. These components can be removed or inserted at any time without
preparing the operating system in advance. While all hot-swappable components are
hot-pluggable, not every hot-pluggable component is hot-swappable.
Each component is discussed in more detail in the sections that follow. (Not
discussed here are any devices that you may attach to the USB port, which are
generally hot-pluggable.)
Caution – The SC card is not a hot-pluggable component. Do not attempt to access
any internal components unless you are a qualified service technician. Detailed
service instructions can be found in the Sun Fire V490 Server Parts Installation and
Removal Guide, which is included on the Sun Fire V490 Documentation CD.
Power Supplies
Sun Fire V490 power supplies are hot-swappable—they can be removed or inserted
at any time without prior software preparation. Keep in mind that a power supply is
hot-swappable only as long as it is part of a redundant power configuration—a
system configured with both power supplies in working condition. (Logically, you
cannot “hot-swap” a power supply if it is the only one in the system that still
works.)
Unlike other hot-pluggable devices, you can install or remove a power supply while
the system is operating at the ok prompt when the blue OK-to-Remove LED is lit.
For additional information, see “About the Power Supplies” on page 38. For
instructions on removing or installing power supplies, see the Sun Fire V490 Server
Parts Installation and Removal Guide.