[DRBD-user] Hi

Arnaud Defos arnaud.defos at gmail.com
Thu Sep 17 13:33:43 CEST 2015

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


I use drbd with heartbeat and expose an iscsi target.

I am on debian 7.

I use xenserver on 3 hosts :
 - host1 : one VM, SAN0
 - host2 : one VM SAN1
 - host3 : one VM vm1

on host1 and host2, I install with success drbd, heartbeat and iscsi. When
I stop heartbeat on host1, host2 becomes primary and exposes the iscsi

host3 uses only iscsi device.

When I stop heartbeat on host1, vm1 becomes unavailable. I have several
errors like :
buffer i/o error on device logical block

It is impossible to control the machine again.

Here is the configuration file of drbd :

resource res0 {
  protocol C;
  device /dev/drbd0;
  disk /dev/VG0/LVDATA0;
  meta-disk internal;
  startup {
    degr-wfc-timeout 15;
    wfc-timeout 30;
  disk {
    on-io-error   detach;
  handlers {
    split-brain "/usr/lib/drbd/notify-split-brain.sh root";
  net {
    # Après la détection du split brain, aucun primaire détecté, et un des
serveurs n'a fait aucune modification : répliquer les modifications sur ce
    after-sb-0pri discard-zero-changes;
    # Après un split brain, un primaire détecté : le secondary est
systématiquement la split brain victim
    after-sb-1pri discard-secondary;
    # Après un split brain, 2 primary détectés : déconnexion
    after-sb-2pri disconnect;
  syncer {
    verify-alg sha1;
    rate 100M;
  on SAN00 {
    address; # adresse ip et port d'écoute
  on SAN01 {
    address; # adresse ip et port d'écoute

haresources for heartbeat :
SAN00 IPaddr:: drbddisk::res0 iscsitarget

Do you have any ideas ?


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