Booting from two drives in stages, was Combining / and /boot in different ZFS pools
list1 at gjunka.com
Tue Jan 2 22:28:34 UTC 2018
Trying this question again but rewording it differently.
Is it possible to boot the system in such a way that the kernel is
loaded from the /boot folder from one ZFS pool, then once the kernel has
been loaded it mounts a second ZFS pool and loads the system from it
(the reason is that the drive with second pool needs a driver that's
only in the kernel)?
On 01/01/2018 18:49, Grzegorz Junka wrote:
> My motherboard doesn't support booting from NVMe and I am trying to
> install the loader on a USB drive.
> I have two ZFS pools:
> Two NVMe drives, each with two partitions, 1: freebsd-swap, 2:
> freebsd-zfs; ZFS pool tank6 mirror set up on nvd0p2 and nvd1p2
> One USB drive with two partitions, 1: freebsd-boot, 2: freebsd-zfs;
> ZFS pool tank7 using single partition da0p2
> The intention is to have the main root '/' on the NVMe drives and only
> the '/boot' folder on the USB drive (since NVMe is much faster).
> Some of the datasets I have set up (listing dataset and mountpoint):
> tank6 none
> tank6/ROOT none
> tank6/ROOT/default /
> tank7 none
> tank7/ROOT none
> tank7/ROOT/boot /boot
> After creating all the datasets bsdsysinstall installed all the files
> in all the datasets as expected. When in bsdinstall shell (memstick)
> with altroot as /mnt, command 'zfs list' correctly lists all
> filesystems. Also, when executing ls -l, /mnt/boot contains boot files
> (including the kernel in /mnt/boot/kernel), and /mnt/ contains the
> rest of the system.
> I have set up the bootfs as follows:
> gpart bootcode -b /boot/pmbr nvd0
> gpart bootcode -b /boot/pmbr nvd1
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
> zpool set bootfs=tank6/ROOT/default tank6
> zpool set bootfs=tank7/ROOT/boot tank7
> However, when trying to boot from the USB I am getting an error from
> the system loader:
> Can't find /boot/zfsloader
> FreeBSD/x86 boot
> Default: tank7/ROOT/boot:/boot/kernel/kernel
> My guess is that when booting up, the filesystems of tank6 and tank7
> are not mounted and combined correctly. I tried to set tank6 as the
> booting drive in tank7:
> zpool set bootfs=tank6/ROOT/default tank7
> but this throws an error.
> My question is if it's possible to boot the system from '/boot' set up
> on a different ZFS pool than the ZFS pool containing the root '/' folder?
More information about the freebsd-questions