ZFS mirror install /mnt is empty

Trond Endrestøl Trond.Endrestol at fagskolen.gjovik.no
Mon May 13 05:58:41 UTC 2013

On Sun, 12 May 2013 23:11+0200, Roland van Laar wrote:

> Hello,
> I followed these[1] step up to the Finishing touches.
> I'm using a 9.1 Release.
> After the install I go into the shell and /mnt is empty.
> The mount command shows that the zfs partitions are mounted.
> When I reboot the system it can't find the bootloader.
> What can I do to fix this?
> Thanks,
> Roland van Laar
> [1] https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/9.0-RELEASE

Looking through the wiki notes I would do a couple of things in a 
different way.

Since you're running 9.1-RELEASE you should take into account the need 
for the /boot/zfs/zpool.cache file until 9.2-RELEASE exist or you 
switch to the latest 9-STABLE.

Create your zpool using a command like this one:

zpool create -o cachefile=/tmp/zpool.cache -m /tmp/zroot zroot /dev/gpt/disk0

Copy the /tmp/zpool.cache file to /tmp/zroot/boot/zfs/zpool.cache, or 
in your case to /mnt/boot/zfs/zpool.cache after extracting the base 
and kernel stuff.

In the wiki section Finishing touches, perform step 4 before step 3. 
The final command missing in step 3 should be zfs unmount -a once 
more. Avoid step 5 at all cost!

Maybe this recipe is easier to follow, it sure works for 9.0-RELEASE 
and 9.1-RELEASE, I only hope you're happy typing long commands, and 
yes, command line editing is available in the shell:


Due to advances in hard drive technology, for the worse I'm afraid, 
i.e. 4K disk blocks, I wouldn't bother enabling compression on any ZFS 
file systems. I might change my blog posts to reflect this stop gap.

If you do happen to have 4K drives, you might want to check out this 
blog post:


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