DiskBoards 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 reconfiguredso 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 boardcontains 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.