[DRBD-user] My first splitbrain

[Gerald Brandt]

Hi,

I did:

drbdadm secondary iscsi.target.0
drbdadm -- --discard-my-data connect iscsi.target.0
 
and heartbeat immediately made the box primary again.  I killed heartbeat and did it again, and this time it stayed secondary.  I'm just about ready to reconnect the DRBD sync ethernet cable (and the iSCSI cable).  I hope it works.

Gerald


----- Original Message -----
> From: "Florian Haas" <florian at hastexo.com>
> To: drbd-user at lists.linbit.com
> Sent: Tuesday, November 8, 2011 11:39:17 AM
> Subject: Re: [DRBD-user] My first splitbrain
> 
> On 2011-11-08 18:02, Gerald Brandt wrote:
> > Hi,
> > 
> > I'm still not sure why it happened, but I had my first splitbrain.
> > 
> > My clients are back up on one server, and I'm trying to figure out
> > how to stop the splitbrain from occurring again
> 
> disk {
>   fencing resource-only;
> }
> 
> handlers {
>     fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
>     after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh";
> }
> 
> > when I plug the ethernet cables in again (both still think they are
> > primary).
> > 
> > On the currently disconnected server, can I do:
> > 
> > drbdadm secondary iscsi.target.0
> > drbdadm connect --discard-my-data iscsi.target.0
> > 
> > and when I plug the cables back in, things should be okay?
> 
> Depends on your definition of "okay". Of course you will lose the
> modifications that occurred on this node since the split brain
> happened
> (which may be some time before it was detected, of course).
> 
> But yes, what you are suggesting will kick off a bitmap-based sync,
> with
> the node where you're doing this becoming the SyncTarget.
> 
> Cheers,
> Florian
> 
> --
> Need help with DRBD?
> http://www.hastexo.com/now
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