Date: Thu, 20 Mar 2014 11:52:11 -0400 From: Adam McDougall <mcdouga9@egr.msu.edu> To: freebsd-stable@freebsd.org Subject: Re: Can ZFS boot from other than the root of a pool? Message-ID: <532B0EAB.6080608@egr.msu.edu> In-Reply-To: <532AFB89.6060203@denninger.net> References: <532AF77A.9010204@denninger.net> <CAOjFWZ7xy01UXkPrB2wfN3=YMn9ToHL81a4SHzToa5sDV0YUqA@mail.gmail.com> <CAOjFWZ7=ZczHsjrLo2cLjQYAdwhD7wc3kz37GXarbMLeciMySA@mail.gmail.com> <CAPS9%2BSti9F0waFjgCfXtkxz5zW8sDp8=rv=HZujovpp_wg4cmQ@mail.gmail.com> <532AFB89.6060203@denninger.net>
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On 03/20/2014 10:30, Karl Denninger wrote: >>> On Mar 20, 2014 7:13 AM, "Karl Denninger" <karl@denninger.net> wrote: >>>> For a number of reasons having to do with backup strategy I want to >>>> mount >>> a ZFS root from "poolname/root" instead just "poolname." >>>> That works ok; I can set in /boot/loader.conf: >>>> vfs.root.mountfrom="zfs:zroot/root" > It LOOKS to me like this will work too: > > zpool set bootfs tank/bootfs > > ... and in loader.conf (in /boot/loader.conf on tank/bootfs) set the > root SOMEWHERE ELSE. > > That has certain advantages, particularly if you want a GELI-encrypted > root. > > I'll play with this a bit.... (the ability to make upgrades much less > dangerous in that an immediate-revert becomes pretty easy helps too) > You don't need to set vfs.root.mountfrom in recent versions. This makes it much easier. I've been booting from /rpool/ROOT/freebsd for years (sometimes alternate paths when I want to load another copy of FreeBSD). Setting bootfs should do the trick.
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