Digital Equipment Prioris XL 6000 Series, Service Maintenance Manual

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Installing Expansion Boards
7-4
Server Boot Sequence
The server boot sequence is as follows:
1. If a bootable CD-ROM drive is enabled and a bootable CD-ROM is put in
this drive, the server ignores all other settings and boots from the CD-ROM.
2.
If a CD-ROM is not present, the operating system can boot from either drive
A or C depending on how an option in the SCU has been set. This option
determines which drive is selected first as the boot device.
One option is A: then C: (default). In this case, the server first selects drive
A to boot the operating system. If a diskette is not inserted in drive A, the
server then selects drive C: to boot the operating system.
If the setting is C: then A:, then drive C: is selected as the boot drive first. If
a bootable operating
system is not found, then drive A: is selected.
Drive C can be attached to the embedded SCSI controller or a PCI expansion
board.
The location of drive C is determined by the server scan sequence described
next.