Date: Sun, 8 Jan 2012 17:17:30 -0800 From: Matt Mullins <mokomull@gmail.com> To: Drew Tomlinson <drew@mykitchentable.net> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS Root Won't Mount - Unknown Filesystem Message-ID: <CAPyT1SGp=i%2Bhr1eYE3i3a8cW3-p=r7=57fbJZ2XnBRv9P102HA@mail.gmail.com> In-Reply-To: <4F08684C.2070809@mykitchentable.net> References: <4F08684C.2070809@mykitchentable.net>
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On Sat, Jan 7, 2012 at 7:44 AM, Drew Tomlinson <drew@mykitchentable.net> wr= ote: > I'm attempting a new install of 9.0-RC3 amd64. =A0My system has 4 500 GB > drives. =A0Using this tutorial as a guide: > > http://www.aisecure.net/2011/11/28/root-zfs-freebsd9/ When I built my ZFS-root system, I did most of these things, except I had a slightly different setup for the root filesystem itself. What I did is akin to: # zpool import -o altroot=3D/target -o cachefile=3D/tmp/zpool.cache zroot # zfs set mountpoint=3D/ zroot # cp -a /tmp/zpool.cache /target/boot/zfs/zpool.cache I did not manually set mountpoints for anything but the root filesystem. It sounds like manually-set mountpoints are the way most people do it, but you can try to clear the mountpoints by doing: # zfs inherit mountpoint zroot/fs for each filesystem in your root pool. > I created a boot and a freebsd-zfs partition on each drive. =A0Then I cre= ated > a raid1z pool using all 4 drives. =A0I followed the rest of the tutorial > exactly and ensured that I copied the zpool.cache to boot/zfs. > > When I try to boot my new system, it all goes fine up until it's time to > mount zfs:zroot. =A0It fails with an "error 2" "unknown filesystem" error= . =A0I > don't know if this means anything but at the mountfrom prompt, the system > will not accept any keyboard input. =A0Same keyboard works fine when boot= ed > into LiveCD. I had that same problem with mine for a while, and it turned out that importing with the "altroot" option implies "cachefile=3Dnone"; until I realized I needed to also specify "cachefile=3D/some/path", I had accidentally ended up with a /boot/zpool.cache that didn't actually reference any zpools. > Unfortunately because I can't figure out how to get a LiveCD type > environment with sshd running, I can't copy and paste exact error message= s > or command outputs. I was using PXE/NFS booting to install this machine, so unfortunately I can't help you here. > I've searched and the two things that seem to be important are that there= 's > a zpool.cache file and that the zfs partitions are correct. =A0A 'gpart s= how > -l' shows my partitions something close to this: > > 34 <big number> =A0 =A0ada0 =A0 =A0GPT (456G) > 34 =A0 =A0128 =A0 =A0 =A0 =A0 =A0 =A0 1 =A0 =A0 =A0 null (128K) > 162 <big number> =A0 2 =A0 =A0 =A0 disk0 (456G) > > What have I done wrong and what do I need to do to get my zfs:zroot pool > mounted as root? It sounds like you're almost there! My guess is that the cache file is what is missing/incorrect. Reading over some man pages, make sure you don't do a "zpool export" before you copy the cache file; exporting the array removes it from the cache and/or deletes the cache file entirely. If you end up with a LiveCD that lets you copy these things, it might help to see # zpool list -o name,altroot,cachefile # zpool status # zfs list -o name,mountpoint,mounted Hope some of this helps. -- Matt Mullins
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