Date: Sun, 28 Dec 2014 18:15:22 +0000 From: Paul Chakravarti <paul.chakravarti@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: ZFS: Mount partition from ZVOL with volmode=dev Message-ID: <53312533-1A45-4BCF-9841-B9CA2E48578B@gmail.com> In-Reply-To: <32BEFAB7-936E-42F0-AE75-FB978C13885C@gmail.com> References: <91E1211B-7E84-472B-8098-630AE8C97251@gmail.com> <32BEFAB7-936E-42F0-AE75-FB978C13885C@gmail.com>
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> > Sorry - I should have been clearer. The zvol shows up on the host
> > system but the partitions aren’t exposed to geom.
>
> That's exactly what volmode=dev does, if you want geom ones don't
> specify volmode.
OK, that make sense
> > Using volmode=default (geom - vfs.zfs.vol.mode=1) causes the installer to fail
> > when you try to create a UFS filesystem under bhyve - it is possible to get
> > round this by creating the partitions manually but my preference would be to
> > use volmode=dev.
>
> What error do you get?
If you try a UFS install on a device with volmode=geom you get the following error message (zfs install or creating partitions manually outside the VM works fine):
Error mounting partition /mnt: mount: /dev/vtbd0p2: Invalid argument
This has been discussed on freebsd-virtualisation (https://lists.freebsd.org/pipermail/freebsd-virtualization/2014-August/002748.html) where they recommend setting volmode=dev
I actually think I have solved my immediate problem (though it is a bit cumbersome)- if I create my template vol with volmode=dev I can send/recv a snapshot to create a clone with volmode=geom, mount the partition on the host system and edit the contents, and then send/recv a second clone with volmode=dev.
Thanks, Paul
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