From owner-freebsd-doc@FreeBSD.ORG  Wed Oct 19 09:41:24 2005
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Date: Wed, 19 Oct 2005 11:40:51 +0200
From: Marko Cuk <cuk@cuk.nu>
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Subject: RAID1 gmirror in handbook 
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Hello !

I have checked the documentation for gmirror - RAID1 in handbook and it 
has some minor mistakes, like

Initialize GEOM; this will load the /boot/kernel/geom_mirror.ko kernel 
module:

# geom load


By my oppinion, more correct is

gmirror load  or "kldload geom_mirror.ko" 



Also, if you track manuals, you'll have problem with first disk, when inserting it to gm0 

Output:
gmirror cannot access provider ad0


Solution was, go to boot -s , 
dd if=/dev/zero of=/dev/ad0 bs=512 count=79

and then reinsert the disk.


Many thanks, 

Marko Cuk, ftp2.si.freebsd.org owner.