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Disk Boards and Components 5-5
5
5.4 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
peripheral 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.
5.5 Disk Boards
A maximum of two Disk boards can be installed in Enterprise 6000 systems;
four Disk boards can be installed in Enterprise 5000/4000 systems.
Note – Disk boards can be installed only in slots 14 and 15 in Enterprise 6000
systems, and slot 15 must be used when installing only one Disk board.
Each Disk board contains a fast and wide single-ended SCSI chain with sockets
for two disks. There are three status and two activity LEDs; each activity LED
is driven directly by a disk drive.