GPT label for ZFS GPT partitions no longer recognized (Was: New FreeBSD snapshots and virtual machine disk images (20140106 r260369))

[Trond Endrestøl]

On Tue, 14 Jan 2014 17:11+0100, Trond Endrestøl wrote:

> On Tue, 7 Jan 2014 21:08-0500, Glen Barber wrote:
> 
> > o 10.0-PRERELEASE amd64
> 
> > FreeBSD-10.0-PRERELEASE-amd64-20140106-r260369-disc1.iso
> 
> I tried the experimental ZFS stuff in bsdinstaller, I chose a mirrored 
> pool using 4K disk blocks, and I noticed the zfs0 and zfs1 labels are 
> indeed shown when running gpart show -l after the first reboot, but 
> only the gptboot{0,1} and swap{0,1} labels shows up in the /dev/gpt 
> directory. I guess gnop is doing some mischief to the GPT.

I did some googling and found out that during the zpool import step of 
the gnop create, zpool create, zpool export, gnop destroy, zpool 
import dance, you should tell ZFS (or actually zpool) to look for 
devices in the /dev/gpt directory, like this:

zpool import -d /dev/gpt -o cachefile=/tmp/zpool.cache zroot

I believe you still need to copy the temporary cachefile to the 
/boot/zfs directory in the BE. Luckily, this treatment doesn't hide 
the /dev/gpt/zfs{0,1} GPT labels after rebooting.

I think it would be better for all of us if 
usr.sbin/bsdinstall/scripts/zfsboot would run zpool import with the -d 
option after destroying the *.nop devices, until the scenario with the 
missing GPT labels is resolved.

Any thoughts?

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