Sun Microsystems 5500, Reference Manual

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5-6 Sun Enterprise 6500/5500/4500 Systems Reference Manual • April 1998
5.5 Disk Boards
A maximum of two Disk boards can be installed in Enterprise 6500 systems; four
Disk boards can be installed in Enterprise 5500/4500 systems.
Note –
Disk boards can be installed only in slots 14 and 15 in Enterprise 6500
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.
5.5.1 Removing a Board
5.5.1.1 Removing a Board from a Powered-On System
Caution –
Remove a board from a powered-on system only after the ASR software
has disabled the board. If a board has not been disabled by the ASR software, then
the operating system should be halted and the system powered off prior to board
removal. See Chapter 11 “Powering Off and On” and then Section 5.5.1.2 “Removing
a Board from a Powered-Off System.”
1. Ensure that the board has been disabled by the ASR software. See Section 5.4
“Hot-Plug Feature.”
Once disabled by ASR, one of two results occur:
■
The three LEDs on the board are not lit (board has no power)
■
The outer two green LEDs are not lit and the middle yellow LED is lit (board in
low power mode).
Note –
System software operates such that the LED pattern described is the same
for a board that is component side-down (installed in front of card cage) or
component-side up (installed in rear of card cage).
2. Unfasten any cable connectors from the front panel and set them aside.
Label cables to identify them for reconnection later.