FreeBSD 8.0: RAID-1 using gpart, gvinum and gmirror
Peter C. Lai
peter at simons-rock.edu
Wed Dec 2 17:16:21 UTC 2009
Why are you using gvinum for RAID 1 instead of gmirror? The gmirror method
for mirroring the boot partition is already well documented...
On 2009-12-02 12:35:17PM +0200, Marin Atanasov wrote:
> I'm going to make my partition mirrored using the geom utilities, but
> however I've noticed that I cannot use the same way I used to do it under
> 7.2 and 8.0-RC1.
> Here's the situation - I tried a lot of times to make my root partition
> mirrored using gvinum, but each time when I boot in the new partition I'm
> unable to boot from it.. So instead of using gvinum for the root partition
> I've decided to use gmirror - and it works!
> I did it the following way - two NOT identical disks are added to the
> - 1 slices on the first disk
> - 2 slices on the second one (the 1st slice is the size of the root
> partition which is on the 1st slice on the 1st disk)
> Right after a fresh minimal install, I go to single-user mode and create the
> # gmirror label -vb round-robin gm0 /dev/ad0s1a
> Installing bootstap code on the second disk (in case I need to boot later
> from it):
> # fdisk -BI /dev/ad4s1
> # bsdlabel -wB /dev/ad4s1
> # newfs -O2 /dev/ad4s1
> # newfs -O2 -U /dev/ad4s2
> And then inserting the second component of the mirror:
> # gmirror insert gm0 /dev/ad4s1
> And this is how I was doing a mirror for the root partition. For the other
> partitions - /usr, /var, /tmp, swap I used gvinum following a different
> articles, howtos and eventually it worked. The complete scenario of how I
> did the mirror for the other partitions is here (sorry, it's too long to
> just copy/paste it in the lists):
> If I can say it with little words - the way mirroring works for the other
> partitions was to overlap all the other partitions with one big vinum
> My problem now is that I cannot do this anymore, because I need to use gpart
> instead for creating the partitions, and using gpart I cannot create a vinum
> partition that will overlap the other partitions, so I cannot make any
> mirror for the other partitions.
> Is there any other way of doing this?
> I'm out of ideas now, perhaps you could help me out with this :)
> Thanks and regards,
> Marin Atanasov Nikolov
> dnaeon AT gmail DOT com
> daemon AT unix-heaven DOT org
> freebsd-stable at freebsd.org mailing list
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Peter C. Lai | Bard College at Simon's Rock
Systems Administrator | 84 Alford Rd.
Information Technology Svcs. | Gt. Barrington, MA 01230 USA
peter AT simons-rock.edu | (413) 528-7428
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