Replacing disks on Proxmox

Source: https://pve.proxmox.com/wiki/ZFS:_Tips_and_Tricks#Replacing_a_failed_disk_in_the_root_pool and https://forum.proxmox.com/threads/autoexpand-on-rpool-zfs.30512/

• Locate the failing disk / the disk you want to replace:

  # zpool status -v

  . In this exemple, we want to replace disk “sdb”

• Detach the disk from the pool:

  # zpool detach rpool sdb2

  , shutdown the Proxmox, replace physically the disk and start the machine

• Create the partitions - depending if you replace the failing disk through a disk with the same size or through a “bigger” one:
  • For a similar disk: copy the partition table from /dev/sda to /dev/sdb:

    # sgdisk --replicate=/dev/sdb /dev/sda

  • For a “bigger” disk: delete its partition table and create a new one:

    # sgdisk -Z /dev/sdb
    # sgdisk -a1 -n1:34:2047 -t1:EF02 -n9:-8M:0 -t9:BF07 -n2:2048:0 -t2:BF01 -c 2:zfs /dev/sdb

• Ensure the GUIDs are randomized:

  # sgdisk --randomize-guids /dev/sdb
  The operation has completed successfully.

• Install the Grub on the new disk:

  grub-install /dev/sdb

• Attach the nex disk to the pool:

  # zpool attach -f rpool sda2 /dev/sdb2

• Let the resilvering function run:

  # zpool status -v