Graphs for DRBD not working

Hi,

The graphs for DRBD are not working (no values) however I can see data via telnet:

1. telnet 192.168.1.10 36602 | sed -n '/<<<drbd>>>/,/<<<.*>>>/p'
   <<<drbd>>>
   version: 8.4.2 (api:1/proto:86-101)
   GIT-hash: 7ad5f850d711223713d6dcadc3dd48860321070c build by dag@Build64R6, 2012-09-06 08:16:10
   0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
   ns:70185244 nr:0 dw:65118492 dr:5896129 al:2248 bm:579 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
   <<<postfix_mailq>>>
   Connection closed by foreign host.