old-www/HOWTO/Remote-Serial-Console-HOWTO/rhl-selectboot.html

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>C.1. Select boot disk</H1
><P
>The key to a remote upgrade is to be able to boot from floppy
disk to perform the upgrade, and then to reboot from the hard disk.
The possibilities are:</P
><P
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><OL
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><LI
><P
>Most <SPAN
CLASS="ACRONYM"
>BIOSs</SPAN
> allow the boot disk order to be
controlled through the <SPAN
CLASS="ACRONYM"
>BIOS</SPAN
>' configuration. If
the <SPAN
CLASS="ACRONYM"
>BIOS</SPAN
> supports a serial console then the
machine can be upgraded whilst leaving the floppy disk in the
drive. No one need attend the site to upgrade the operating
system</P
></LI
><LI
><P
>Someone can insert a floppy disk before the upgrade and
remove it afterwards. Most co-location sites will provide this
level of <SPAN
CLASS="QUOTE"
>"board-swap"</SPAN
> technical support.</P
></LI
><LI
><P
>Two records of the CMOS memory which stores the
<SPAN
CLASS="ACRONYM"
>BIOS</SPAN
> configuration can be made: one for booting
from floppy and another for booting from hard disk.
Unfortunately the nvram device driver does not yet work on a wide
enough variety of machines for this HOWTO to pursue this option
further.</P
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