После перезагрузки сервера выходит grub rescue. Раздел /boot не виден.
При загрузке с livecd не удается примонтировать пул zfs для восстановления данных. Очень нужны данные с раздела sbd2
ubuntu@ubuntu:~$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0    7:0    0   1.9G  1 loop /rofs
loop1    7:1    0  89.1M  1 loop /snap/core/7917
loop2    7:2    0  54.5M  1 loop /snap/core18/1223
loop3    7:3    0 149.9M  1 loop /snap/gnome-3-28-1804/71
loop4    7:4    0   4.2M  1 loop /snap/gnome-calculator/501
loop5    7:5    0  14.8M  1 loop /snap/gnome-characters/317
loop6    7:6    0   956K  1 loop /snap/gnome-logs/81
loop7    7:7    0  44.2M  1 loop /snap/gtk-common-themes/1353
sda      8:0    0 111.8G  0 disk
├─sda1   8:1    0 111.8G  0 part
└─sda9   8:9    0     8M  0 part
sdb      8:16   0   2.7T  0 disk
├─sdb1   8:17   0  1007K  0 part
├─sdb2   8:18   0   2.7T  0 part
└─sdb9   8:25   0     8M  0 part
sdc      8:32   0 111.3G  0 disk
sr0     11:0    1   2.3G  0 rom  /cdrom
ubuntu@ubuntu:~$ zpool import
cannot discover pools: permission denied
ubuntu@ubuntu:~$ sudo zpool import
   pool: rpool
     id: 12980673136243053646
  state: UNAVAIL
status: One or more devices are missing from the system.
action: The pool cannot be imported. Attach the missing
        devices and try again.
   see: http://zfsonlinux.org/msg/ZFS-8000-6X
config:

        rpool                    UNAVAIL  missing device
          sdb2                   ONLINE
        logs
          mirror-1               UNAVAIL  insufficient replicas
            sdb                  UNAVAIL  corrupted data
            8133131773784130421  UNAVAIL

        Additional devices are known to be part of this pool, though their
        exact configuration cannot be determined.

ubuntu@ubuntu:/$ sudo zdb -e -C rpool

MOS Configuration:
        version: 5000
        name: 'rpool'
        state: 0
        txg: 15312122
        pool_guid: 12980673136243053646
        errata: 0
        hostid: 2056645051
        hostname: 'ubuntu'
        com.delphix:has_per_vdev_zaps
        vdev_children: 2
        vdev_tree:
            type: 'root'
            id: 0
            guid: 12980673136243053646
            children[0]:
                type: 'disk'
                id: 0
                guid: 11098730369014509301
                path: '/dev/sda2'
                whole_disk: 0
                metaslab_array: 256
                metaslab_shift: 34
                ashift: 12
                asize: 2998946496512
                is_log: 0
                DTL: 3467
                create_txg: 4
                com.delphix:vdev_zap_leaf: 129
                com.delphix:vdev_zap_top: 130
            children[1]:
                type: 'mirror'
                id: 1
                guid: 14529203028178577684
                metaslab_array: 260
                metaslab_shift: 30
                ashift: 12
                asize: 119438573568
                is_log: 1
                create_txg: 467
                com.delphix:vdev_zap_top: 132
                children[0]:
                    type: 'disk'
                    id: 0
                    guid: 1929413922049645180
                    path: '/dev/sdb1'
                    devid: 'scsi-36d4ae520a426ba00236b0981069d45d8-part1'
                    phys_path: 'pci-0000:03:00.0-scsi-0:2:1:0'
                    whole_disk: 1
                    DTL: 3469
                    create_txg: 467
                    com.delphix:vdev_zap_leaf: 133
                children[1]:
                    type: 'disk'
                    id: 1
                    guid: 8133131773784130421
                    path: '/dev/sdc1'
                    devid: 'scsi-36d4ae520a426ba00236b098e076f3a7b-part1'
                    phys_path: 'pci-0000:03:00.0-scsi-0:2:2:0'
                    whole_disk: 1
                    not_present: 1
                    DTL: 3468
                    create_txg: 467
                    expansion_time: 1582115899
                    com.delphix:vdev_zap_leaf: 134
        features_for_read:
            com.delphix:hole_birth
            com.delphix:embedded_data