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====== DRBD su WAN ======
**Persone/Sedi coinvolte**: 
  * Stefano Stalio (LNGS)
  * Federico Zani (Roma2)
  * Domenico Diacono & Giacinto Donvito (Bari)
  * Cristina Aiftimiei (Padova)

===== Setup =====
  * creati due device replicati tra le varie sedi in arch. Active/passive ( o Primary/Secondary)
    * cream-11.pd - Primary / test-nat-linux.lngs - Secondary
    * glsrv.ba - Primary / ozone.rm2 - Secondary

===== Test =====
  * versione DRBD 8.4 installata su tutti i nodi
  * Esempi di file di configurazione & righe modificate:
    * /etc/drbd.d/global_common.conf
<code>
global {
	usage-count yes;
	# minor-count dialog-refresh disable-ip-verification
}
common {
[...]
	net {
		protocol C;
	}
        syncer {
                 rate 300M;
        }
}
</code>
    * /etc/drbd.d/r0.res
<code>
# create new

resource r0 {
  
# DRBD device

   device /dev/drbd0;
   meta-disk internal;

   on test-nat-linux.lngs.infn.it {
      disk  /dev/vdb1;
      address  192.84.135.204:7788;
   }

   on cream-11.pd.infn.it {
      disk /dev/vg_r0/lv_r0; 
      address 193.206.210.164:7788;
   }
}
</code>

  * Verificata scrittura file sul disco montato sul primary server, smontare, scambio tra primary e secondary host, montare il disco sul secondo host (diventato primary) - tutti i file sono ancora presenti.

===== File di log =====
  * [[https://dl.dropboxusercontent.com/u/34258911/cloud_new/drbd.txt | DRBD install & config]]

===== References =====

  * [[http://www.drbd.org/users-guide/drbd-users-guide.html|Oficial DRBD Documentation]] 
  * [[http://www.drbd.org/users-guide/s-configure-resource.html|DRBD Configuration]]
  * [[http://www.server-world.info/en/note?os=Scientific_Linux_6&p=drbd|DRBD Setup on SL6]]
  * [[http://www.drbd.org/users-guide/s-manual-fail-over.html|DRBD Manual Failover]]