[HOWTO] FreeBSD system disk mirroring with GEOM
Paul Mather
paul at gromit.dlib.vt.edu
Wed Jan 19 06:28:30 PST 2005
On Mon, 2005-01-10 at 17:36 +0100, Ralf S. Engelschall wrote:
> FYI: I've prepared a detailed step-by-step command list on how to
> establish a RAID-1 (mirror) for the system partitions with GEOM and
> gmirror(8). You can find the resulting HOWTO document under
> http://people.freebsd.org/~rse/mirror/
Congratulations on a useful and comprehensive HOWTO! I have only one
question: in the first approach ("Whole Disk, Acceptable, Less
Flexible"), why do you create a slice if you are using the whole disk
anyway? Is this simply because it's good form to put a valid partition
table on a bootable PC disk?
The reason I ask is because when I set up my bootable gmirror (using a
technique similar to the one you describe) I omitted the fdisk step and
used bsdlabel on (my equivalent of) /dev/mirror/gm0 (not gm0s1). I've
not had any problems booting the mirror, nor in using it. It also means
one less GEOM layer to go through, right?
Cheers,
Paul.
--
e-mail: paul at gromit.dlib.vt.edu
"Without music to decorate it, time is just a bunch of boring production
deadlines or dates by which bills must be paid."
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