Date: Thu, 20 Mar 2014 07:19:13 -0700 From: Freddie Cash <fjwcash@gmail.com> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Fwd: Re: Can ZFS boot from other than the root of a pool? Message-ID: <CAOjFWZ7=ZczHsjrLo2cLjQYAdwhD7wc3kz37GXarbMLeciMySA@mail.gmail.com> In-Reply-To: <CAOjFWZ7xy01UXkPrB2wfN3=YMn9ToHL81a4SHzToa5sDV0YUqA@mail.gmail.com> References: <532AF77A.9010204@denninger.net> <CAOjFWZ7xy01UXkPrB2wfN3=YMn9ToHL81a4SHzToa5sDV0YUqA@mail.gmail.com>
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Forgot to include the list in the original reply. Typos and terseness brought to you by the LG G2 running SlimKat. ---------- Forwarded message ---------- From: "Freddie Cash" <fjwcash@gmail.com> Date: Mar 20, 2014 7:17 AM Subject: Re: Can ZFS boot from other than the root of a pool? To: "Karl Denninger" <karl@denninger.net> Cc: 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" > > But -- I cannot actually boot from there. Unless the /boot directory is in zfs:/zroot the system cannot find it, and I see no obvious way to "teach" the loader that I want it to look in the filesystem under the top level. > > This isn't a terrible pain as I can simply mount zroot on /mnt and then copy zroot/root/boot over to zroot/boot whenever I make changes to the kernel or boot environment (which is infrequent) but I'm wondering if I'm missing something that would make booting directly from the filesystem where root is specified to be possible. > > (Obviously until the loader.conf file is found the system doesn't know where root is either, so this does look at first blush to be a "chicken and egg" problem.) Read up on Boot Environments, install the beadm port, set the bootfs property on the pool itself, and you'll be off to the races.
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