Question
I have system which was installed a few years ago. Initially, it was Ubuntu 18.04 with the boot drive set with ZFS installed using this guide. After upgrades it is now 22.04.
The pool is configured as a mirror with two same Samsung SSD drives.
I have recently realized that I can boot only using one of them (setting it as a boot drive in UEFI).
I would like to fix that and be able to boot with any of them in case of failure of the bootable one.
Solution?
In the mentioned guide there is a step called MIRROR GRUB describing the following command, which I probably didn't execute during the initial setup, but now I'm on Ubuntu 22.04 and probably a lot has changed since Ubuntu 18 so I'm not sure if these commands are the best approach?
umount /boot/efi
dd if=/dev/disk/by-id/scsi-SATA_disk1-part2 \
of=/dev/disk/by-id/scsi-SATA_disk2-part2
efibootmgr -c -g -d /dev/disk/by-id/scsi-SATA_disk2 \
-p 2 -L "ubuntu-2" -l '\EFI\ubuntu\shimx64.efi'
mount /boot/efi
Current state
My pool looks as following:
$ sudo zpool list
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
rpool 232G 125G 107G - - 50% 53% 1.00x ONLINE -
$ sudo zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 126G 98.8G 96K /
rpool/ROOT 89.7G 98.8G 96K none
rpool/ROOT/ubuntu 89.7G 98.8G 4.38G /
rpool/ROOT/ubuntu/0058cf6ec00f84c29d63ef43d847ecbca59793453b622b36b35d9a8fd525ec3d 90.5M 98.8G 186M legacy
rpool/ROOT/ubuntu/04582170cd4d7786ba31a845910ba3a948801baac4985d737ce9c63ee673629c 18.6M 98.8G 204M legacy
[... lot of othere pools with strange guids ...]
rpool/home 593M 98.8G 112K /home
rpool/home/root 12.0M 98.8G 556K /root
rpool/swap 8.50G 99.8G 7.52G -
rpool/var 2.60G 98.8G 96K /var
rpool/var/cache 65.6M 98.8G 65.6M /var/cache
rpool/var/log 2.54G 98.8G 2.54G legacy
rpool/var/nfs 96K 98.8G 96K /var/lib/nfs
rpool/var/spool 268K 98.8G 268K /var/spool
rpool/var/tmp 160K 98.8G 160K legacy
$ zpool status
pool: rpool
state: ONLINE
scan: scrub repaired 0B in 00:06:06 with 0 errors on Thu Mar 2 03:06:08 2023
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K100741M-part1 ONLINE 0 0 0
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K551125K-part1 ONLINE 0 0 0
errors: No known data errors
$ ls -1 /dev/disk/by-id | grep Samsung
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K100741M
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K100741M-part1
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K100741M-part3
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K551125K
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K551125K-part1
ata-Samsung_SSD_860_EVO_250GB_S3YJNB0K551125K-part3
If I select my second drive as bootable in my UEFI then GRUB starts in recovery mode instead of booting the system.
Is the above script still gonna work in my setup?
