Sun Microsystems 6.0005E+11 manual Hot-Plug Feature, I/O Boards

3

3.4 Hot-Plug Feature

Enterprise systems have extensive error detection mechanisms, and an Automatic System Reconfiguration (ASR) feature that enables the system to be rebooted with failed components (such as CPUs, memory, or I/O) disabled. When an error is detected, the system can be reconfigured so that the board containing the failed components is placed in low power mode and is no longer accessible.

Caution – The peripheral power supply provides the precharge voltages required for hot-plug. Do not attempt hot-plug of a system component if the power supply is missing or inoperative. Use prtdiag(1M) to determine the status of the peripheral power supply.

Caution – If the message: NOTICE: Hot Plug not supported in this system is displayed during boot, do NOT attempt hot-plug in this system or damage to the hardware will occur.

The hot-plug feature enables you to insert a new board into a powered on system, despite the system being “live,” or being supplied with electrical power. When the hot-plug feature is used to add a board to a powered on system, the system will not use the new board until the system is rebooted.

3.5 I/O Boards

Enterprise systems support two types of I/O boards: SBus and Graphics. See

Figure 3-4 through Figure 3-7.

The SBus I/O board includes two SYSIO ASICs that provide two SBuses:

•One for two plug-in SBus cards and two fiber interfaces

•One for one plug-in SBus card and the on-board devices (10/100Mbyte TPE and Single-ended Fast/Wide SCSI)

Note – SBus connector slots 1 and 2 on the SBus I/O board can accommodate a double-wide SBus card.

I/O Boards and Components 3-5