[DRBD-user] Doubt!

Mark Watts m.watts at eris.qinetiq.com
Tue Jul 28 13:04:18 CEST 2009

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

On Tue, 2009-07-28 at 07:46 -0300, Gilberto Nunes wrote:
> Hi
> thanks for reply
> this what I do, actually..
> My doubt is why when I create some files on node-2, when drbd device
> turn back to primary node, the file do not appear.????
> I use heartbeat as well...And I do not mount the drbd device at the same
> time in two hosts...
> The drbd device is only mounted in secondary hosts, when primary hosts
> has fail...
> So, the heartbeat on secondary host, mount the right drbd device for
> me...
> Then I go to partition where drbd device is mount and create some
> files...
> Then, when the primary node back, the heartbeat mount drbd device
> again... But all files that I create when drbd device is mounted on
> secondary hosts, is not there...
> WHY!!!

This suggests that you do not have a valid DRBD pair.

Ensure the following is true (assuming your resource is called "r0":

On the "Master" server:

# /sbin/service drbd status | grep r0
0:r0   Connected  Primary/Secondary  UpToDate/UpToDate  C  /shared  ext3

On the "Slave" server:
# /sbin/service drbd status | grep r0
0:r0   Connected  Secondary/Primary  UpToDate/UpToDate  C

Note that only one device is marked as "Primary" and that the filesystem
is only mounted on one node.


Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Applied Technologies
GPG Key: http://www.linux-corner.info/mwatts.gpg
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