Booting MFS from Secondary Partition
Jonathan McKeown
j.mckeown at ru.ac.za
Mon Mar 8 07:31:36 UTC 2010
On Saturday 06 March 2010 15:02:20 Martin McCormick wrote:
> Fbsd1 writes:
> > just dd the image to what ever drive you want
>
> That is the goal. The challenge is to launch a script
> that detects when the boot device has been unmounted as dd will
> not work on an active file system.
Martin
it may or may not work, but there's a sysctl for the geom subsystem which
might do what you want.
sysctl kern.geom.debugflags=16
This used to be used (for all i know still can be) to allow writing metadata
for (eg) building a gmirror on a mounted disk - it's often referred to as the
``allow-footshooting'' flag.
That might allow you to dd your image onto the mounted disk - i'd either try
it with a handy spare system or wait for someone more expert than i to
comment, though.
Jonathan
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