Date: Fri, 6 Sep 2024 02:01:29 -0400 From: Karl Vogel <vogelke@pobox.com> To: freebsd-questions@freebsd.org Subject: Re: ZFS boot devices specification Message-ID: <ZtqauS9lqXPBosBR@furbag.my.domain> In-Reply-To: <86y146zbef.fsf@gmail.com> References: <86y146zbef.fsf@gmail.com>
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>> On Thu, 05 Sep 2024 05:40:43 -0400,
>> Ludovit Koren <ludovit.koren@gmail.com> may have said:
> I cannot find the recommended way to specify the devices to boot
> from on 13.4-STABLE FreeBSD 13.4-STABLE stable/13-n258224-f702110bc4bc.
> I am using internal disks for the system and external for data.
> The problem occurs when the disks from data array are assigned to
> /dev/da0 and /dev/da1. The booting process starts and finishes on
> remounting root RW, because it cannot find root file system.
> It depends on the order of hardware initialization.
> What is the recommended way of specifying internal disks in ZFS,
> something like disks uid? The mount process tries to mount ZFS
> gpt/zfs0 and gpt/zfs1 (which are shown in zpool status), but they are
> not on /dev/da0 and /dev/da1.
When I installed 13.2, I had a problem finding the root filesystem.
I got this far, did the reboot thing...
Install FreeBSD Handbook? yes (requires network)
Language (en) <empty>
Final configuration Exit
Open shell No
Complete Reboot
...and I ran into this:
Mount from zroot/ROOT/default failed with error 6
mountroot>
The default setting was vfs.root.mountfrom=zfs:zroot/ROOT/default
I fired up Live CD and ran gpart to see where things wound up -- abbreviated
for readability:
root# gpart list
Geom name: ada0
Providers:
1. Name: ada0p1
Mediasize: 272629760 (260M)
label: efiboot0
type: efi
2. Name: ada0p2
Mediasize: 524288 (512K)
label: gptboot0
type: freebsd-boot
3. Name: ada0p3
Mediasize: 4294967296 (4.0G)
label: swap0
type: freebsd-swap
4. Name: ada0p4
Mediasize: 995635494912 (927G)
label: zfs0
type: freebsd-zfs
Consumers:
1. Name: ada0
Mediasize: 1000204886016 (932G)
Sectorsize: 512
Mode: r3w3e6
Geom name: ada1
Providers:
1. Name: ada1p1
Mediasize: 272629760 (260M)
label: efiboot1
type: efi
2. Name: ada1p2
Mediasize: 524288 (512K)
label: gptboot1
type: freebsd-boot
3. Name: ada1p3
Mediasize: 4294967296 (4.0G)
label: swap1
type: freebsd-swap
4. Name: ada1p4
Mediasize: 995635494912 (927G)
label: zfs1
type: freebsd-zfs
Consumers:
1. Name: ada1
Mediasize: 1000204886016 (932G)
Geom name: ada2 [this is from the previous OS]
Providers:
1. Name: ada2p1
label: (null)
type: linux-lvm
Consumers:
1. Name: ada2
Mediasize: 3000592982016 (2.7T)
Geom name: ada3
Providers:
1. Name: ada3p1
Mediasize: 209715200 (200M)
label: efiboot3
type: efi
2. Name: ada3p2
Mediasize: 2147483648 (2.0G)
label: swap3
type: freebsd-swap
3. Name: ada3p3
Mediasize: 2998234251264 (2.7T)
label: zfs3
type: freebsd-zfs
Consumers:
1. Name: ada3
Mediasize: 3000592982016 (2.7T)
Geom name: da0 [This is my SSD]
Providers:
1. Name: da0p1
Mediasize: 272629760 (260M)
label: efiboot2
type: efi
2. Name: da0p2
Mediasize: 524288 (512K)
label: gptboot2
type: freebsd-boot
3. Name: da0p3
Mediasize: 4294967296 (4.0G)
label: swap2
type: freebsd-swap
4. Name: da0p4
Mediasize: 995635494912 (927G)
label: zfs2
type: freebsd-zfs
Consumers:
1. Name: da0
Mediasize: 1000204886016 (932G)
Turns out that "zpool import" can use the gpart stuff to import existing
pools for use:
root# zpool import
pool: zroot
state: ONLINE
action: can be imported using pool name or numeric ID
config:
NAME STATE
zroot ONLINE
mirror-0 ONLINE
ada0p4 ONLINE
ada1p4 ONLINE
da0p4 ONLINE
I tried "zpool import zroot" but the system said the a pool with that
name already exists. Running "zpool list" crashed immediately.
mountroot> zfs:zroot/ada0p4
also failed. Booted from DVD and used a different pool name:
mountroot> cd9660:/dev/cd0 ro
(press return for /bin/sh)
# zpool import newroot
When booting from DVD, you can also go to Shell and run this:
# zfs mount newroot/ROOT/default
It mounted as /, which conflicted with the DVD but at least let me modify
files. I editied /boot/loader.conf and added the mountfrom= line:
root# cp /boot/loader.conf /boot/loader.conf.orig
root# vi /boot/loader.conf
root# cat /boot/loader.conf
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
cryptodev_load="YES"
zfs_load="YES"
vfs.root.mountfrom="zfs:newroot/ROOT/default"
After that, the system came up without problems. Hope this helps.
--
Karl Vogel I don't speak for anyone but myself
"I know it was you, Fredo. You broke my heart."
--What Taylor Swift whispered to Travis Kelce, 30 Jan 2024
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