sudo apt install drbd-utils ---  и надо ли ещё drbd-`uname -r`

disk {
 on-io-error detach;

 }


resource "iscsi_data" {
  device minor 1;
  meta-disk internal;

  net {
    protocol C;
--------   allow-two-primaries yes;
    fencing resource-and-stonith;
    verify-alg sha1;
  }
  handlers {
    fence-peer "/usr/lib/drbd/crm-fence-peer.9.sh";
    unfence-peer "/usr/lib/drbd/crm-unfence-peer.9.sh";
  }
  on "pcmk-1" {
    disk "/dev/almalinux_pcmk-1/drbd-demo";
    node-id 0;
  }
  on "pcmk-2" {
    disk "/dev/almalinux_pcmk-2/drbd-demo";
    node-id 1;
  }
  connection {
    host "pcmk-1" address 192.168.122.101:7789;
    host "pcmk-2" address 192.168.122.102:7789;
  }
}