# DRBD8 HA /etc/drbd.conf configuration file
resource r0 {
  protocol C;                           # protocol between devices
  startup {
    wfc-timeout 120;                    # wait 2min for other peers
    degr-wfc-timeout 120;               # wait 2min if peer was already
                                        # down before this node was rebooted
    become-primary-on both;
  }
  net {
    allow-two-primaries;
    cram-hmac-alg "sha1";               # algo to enable peer authentication
    shared-secret "xyz";

    # handle split-brain situations
    after-sb-0pri discard-least-changes;# if no primary auto sync from the
                                        # node that touched more blocks during
                                        # the split brain situation.
    after-sb-1pri discard-secondary;    # if one primary
    after-sb-2pri disconnect;           # if two primaries

    # solve the cases when the outcome
    # of the resync decision is incompatible
    # with the current role assignment in
    # the cluster
    rr-conflict disconnect;             # no automatic resynchronization
                                        # simply disconnect
  }
  disk {
    on-io-error detach;                 # detach the device from its
                                        # backing storage if the driver of
                                        # the lower_device reports an error
                                        # to DRBD
  }
  syncer {
    rate 256M;
  }

  on db01 {
    device    /dev/drbd0;
    disk      /dev/sda3;
    address   1.2.3.4:7789;
    meta-disk internal;
  }

  on db02 {
    device    /dev/drbd0;
    disk      /dev/sda3;
    address   1.2.3.5:7789;
    meta-disk internal;
  }
}