[DRBD-user] DRBD State Confusion

Usman Ahmad usmanamalik at gmail.com
Fri Sep 15 17:53:17 CEST 2006

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

No, there is no firewall setup, but same question again, it may be stupid.
How long does a drbd node wait for changing the other node to unknown state
( i guess this is done through different timeout parameters etc.), and if
the other server comes back up again, is it changed normally or not?

on-degr-cmd "echo '!DRBD! pri on incon-degr' | wall ; sleep 60 ; halt -f";
halt -f?


On 9/15/06, Tim Jackson <lists at timj.co.uk> wrote:
> Usman Ahmad wrote:
> > The primary server waited for some time on boot up and then came up.
> > I want the auto-failback on ?
> Are you *really* sure? Are you 100% sure you know what it means?
> You should at least turn it off while you try to debug your setup.
> DRBD can work with it turned on; it just causes unnecessary transitions.
> Even if you have a "preferred" machine, it's probably best that you fail
> back to it manually once you're sure everything is fine.
> In a peer cluster there is rarely a need to automatically fail back to
> one machine as the whole point is they are peers. (That's not to say
> there aren't legitimate reasons to use it, just that there are many
> cases where it's not necessary)
> > Yes, the servers were connected, even if I shutdown the heratbeat the
> > disk is shifted to the secondary server, but they remain in standalone
> > mode, the drbd can talk to each other as the (Secondary server) changed
> > states from primary/unknown to secondary/unkown.
> This doesn't mean DRBD can communicate. On the contrary, the "Unknown"
> means that it can't. The fact it changed state is probably because
> Heartbeat changed the state of DRBD.
> Have you checked your firewall? It's common for people to forget to
> allow DRBD through the firewall between the nodes.
> > I do not understand why? can't find much in the logs, what thing should
> > I look for specifically?
> Anything to do with DRBD in the first instance! Just read the logs and
> follow the logical process through. DRBD/Heartbeat are both quite
> verbose and tells you lots about what they are doing. After you do that,
> if you still don't understand, point us towards the specific items in
> the log where you don't understand.
> > Is it ok to start the heartbeat and the drbd processes at boot time
> > automatically?
> Yes, and you probably want to do that.
> Tim
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Usman Ahmad Malik
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