Combining / and /boot in different ZFS pools
list1 at gjunka.com
Mon Jan 1 18:49:11 UTC 2018
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):
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
Can't find /boot/zfsloader
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?
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