Fan Trays And Power Supplies - Sun Microsystems Fire V890 Service Manual

Components that can be serviced without such preparation are called hot-swappable
components. These components can be removed or inserted at any time without
preparing the operating system in advance.
Sun Fire V890 hot-pluggable components fall into three basic groups:

Fan trays and power supplies

■
Disk drives
■
PCI cards
■
Each group is discussed in more detail in the sections that follow.
Note – PCI and disk hot-plug operations are not supported when the system ok
prompt is displayed. You can only perform these hot-plug operations while the
operating system is running.
Caution – The system controller (SC) card cannot be serviced while the system is
running. Before installing or removing a system controller card, you must power off
the system and disconnect all AC power cords.
Fan Trays and Power Supplies
Sun Fire V890 fan trays and power supplies are hot-swappable—they can be
removed or inserted at any time without requiring prior software preparations. Keep
in mind that a power supply is not considered hot-swappable unless it is part of an
N+1 redundant power configuration—a system configured with the third power
supply. Do not remove a power supply from a working system if its removal would
leave the system with fewer than two working power supplies.
You can install or remove a power supply or fan tray while the system is operating
at the ok prompt. However, in the case of the power supply, you must issue a
reset-all command at the ok prompt in order for the change to be recognized the
next time the operating system is booted.
Note – If you remove a power supply or fan tray while the operating system is
running, wait for an acknowledgement message on the system console before
installing a replacement part; otherwise, the environmental monitoring software will
not recognize the new device and false error conditions will result.
Caution – When hot-swapping a redundant fan tray, do not put your hand into the
empty fan tray bay. The fans in the populated bay are still spinning.
Chapter 1 Preparing to Service the System 7