ZFS + gmirror: how?

Guus Houtzager guus at houtzager.net
Sun Apr 27 18:44:43 UTC 2008


I'm rather new to FreeBSD and I'm having trouble with ZFS and gmirror.  
I've used this guide to install FreeBSD 7 on ZFS:
This goes flawless, however, the /bootdir is still just /dev/ad01sa  
(in my case), so if that disk breaks, I still can't boot from ad1. So  
I thought I could just make a gmirror containing /dev/ad0s1a and  
ad1s1a and use that for /bootdir. This however does not work.
What I did is:
- gmirror load
- gmirror label -v -b round-robin gm0 /dev/ad1s1a
- newfs /dev/mirror/gm0
- mount /dev/mirror/gm0 /mnt/tmp
- dump -L -0 -f- /bootdir | (cd /mnt/tmp && restore -r -v -f-)
- edit /etc/fstab and /mnt/root/etc/fstab: change all references to  
ad0s1a by /dev/mirror/gm0
- echo 'geom_mirror_load="YES"' >> /boot/loader.conf
- echo 'geom_mirror_load="YES"' >> /mnt/tmp/boot/loader.conf
- reboot
However: I can see the bootprocess starting first ZFS followed by a  
message saying it's waiting for GEOM gmirror to start, which it does  
after a little while and then I get a prompt where I can manually tell  
the system where the root filesystem is. And if I tell it zfs:system/ 
root it does not work (my zpool is named system).
Anyone know what I'm doing wrong and what's the best way to do this?  
Thanks in advance!

PS: please CC me in any reply, as I'm not subscribed to this list.  

Guus Houtzager                            Email: guus at houtzager.net
           ++?????++ Out of Cheese error. Redo from start.
                -- Terry Pratchett, Interesting Times

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