[Pacemaker] Couldn't find device [/dev/drbd/by-res/wwwdata]. Expected /dev/??? to exist

[Alisson Landim]

I was following cluster from scratch guide and everything were fine until i get here:

http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/ch08s05.html

The command:
grep ERROR: /var/log/messages | grep -v unpack_resources

Says:
Couldn't find device [/dev/drbd/by-res/wwwdata]. Expected /dev/??? to exist

Crm_mon:
WebFS:0_start_0 (node=Master, call=53, rc=5, status=complete): not installed
WebFS:1_start_0 (node=HPHDX, call=46, rc=5, status=complete): not installed

I double checked and certified that everything the guide said to install i did:
yum install -y drbd-pacemaker
yum install -y gfs2-utils gfs-pcmk

Is something i didn't install? 
the directory -> /dev/drbd/by-res/wwwdata does not exist, i think it should...

Any hint?
 		 	   		  
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