[Pacemaker] unable to load drbd module

[ROBERTO GUERERO]

hi guys,
I was following the pacemaker 1.1 pdf to setup HA on my Centos 6.3 all went ok until i reached storage with drbd, after following the instruction and start to modprobe drbd error showed up and says cannot allocate memory.
Kindly advise on how to fix this issue.
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