[DRBD-user] Primary / Unknown

Felix Frank ff at mpexnet.de
Mon Sep 23 13:33:47 CEST 2013

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

Hmm, in other words, you are purposefully putting your nodes in a split
brain situation?

It's a good thing you think of this case. Because by the nature of a
Primary/Primary setup, there can be no (safe) automatic split brain
recovery. As soon as the link drops, the datasets on your notes can
deviate rapidly.

You can look at
but there is really no sane policy to revocer from this situation.

This all is why you should never run a Primary/Primary setup without a
good STONITH implementation to protect you from data loss. Because
eventually you *will* have to discard the changes from one of the nodes.

I advise to carefully rethink the need for dual-primary operation.


On 08/21/2013 09:56 PM, Victor Belizário wrote:
> Now, i'm in the test with the network. I did a "ifdown eth0" in the
> server01, and the cat /proc/drbd are like this :
> version: 8.3.11 (api:88/proto:86-96)
> srcversion: DA5A13F16DE6553FC7CE9B2
> m:res   cs            ro               ds                 p  mounted  fstype
> 0:tray  WFConnection  Primary/Unknown  UpToDate/DUnknown  C
> Ok, its waiting for connection, perfectly. So i turn on again the
> network, with ifup eth0 and think the state will be Primary / Primary
> again. But...not happens.

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