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I have the following recipe for a preseed install (truncated for readability):

d-i partman-auto/expert_recipe string \
  boot-root :: \
    1 1 1 free \
      $iflabel{ gpt } \
      $reusemethod{ } \
      method{ biosgrub } \
    . \
    512 512 1074 ext2 \
      $defaultignore{ } \
      method{ format } \
      format{ } \
      use_filesystem{ } \
      filesystem{ ext2 } \
      mountpoint{ /boot } \
    . \
    2147 800 -1 $default_filesystem \
      $lvmok{ } \
      lvm_name { root } \
      method{ format } \
      format{ } \
      use_filesystem{ } \
      $default_filesystem{ } \
      mountpoint{ / } \
    . \
    100% 512 100% linux-swap \
      $lvmok{ } \
      in_vg{ vg_01 } \
      method{ swap } \
      format{ } \
    . \
    100 10000 -1 $default_filesystem \
      $defaultignore{ } \
      method{ lvm } \
      device{ /dev/sdb } \
      vg_name{ vg_01 } \
    [...]
    .

This makes almost what I want, the only issue is that partman-auto creates the Physical Volume inside a partition of /dev/sdb (i.e pvcreate /dev/sdb1).

What I really want is partman-auto to create the PV on the whole device (i.e pvcreate /dev/sdb).

The reason why I want to do this is simple: easy online (hot) extend. (This is for a virtual environment).

I have tried multiple solutions but none of them seems to be working like removing the PV from my recipe and adding to my preseed file:

d-i partman/early_command \
  string dd if=/dev/zero of=/dev/sdb bs=512 count=1; pvcreate -ffy /dev/sdb; vgcreate -fy vg_01 /dev/sdb

But this make the installer either fail or hang asking me what partition layout I want.

Please help me if you know how to accomplish what I want or even if you know that it's impossible with preseed only at this time.

Thank you.

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