> -----Ursprüngliche Nachricht-----
> Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> ha.org] Im Auftrag von Andreas Kurz
> Gesendet: Montag, 21. Juli 2008 15:16
> An: General Linux-HA mailing list
> Betreff: Re: [Linux-HA] after drbd-splitbrain both primary
>
> On Mon, Jul 21, 2008 at 2:52 PM, Schmidt, Florian
> <[EMAIL PROTECTED]> wrote:
> >> -----Ursprüngliche Nachricht-----
> >> Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> >> ha.org] Im Auftrag von Michael Schwartzkopff
> >> Gesendet: Montag, 21. Juli 2008 14:39
> >> An: General Linux-HA mailing list
> >> Betreff: Re: [Linux-HA] after drbd-splitbrain both primary
> >>
> >> Am Montag, 21. Juli 2008 14:35 schrieb Schmidt, Florian:
> >> > Hi everyone,
> >> >
> >> > While testing my cluster I just disconnected the DRBD-link.
> >> > I expected the following:
> >> >
> >> > Because only the DRBD-link (=second heartbeat-link) was down, heartbeat
> >> > still knows that both nodes are up and does not change anything. DRBD
> >> > should stay in primary/secondary state but because of the
> >> > drbd-split-brain this should be seen as primary/unknown on the first and
> >> > secondary/unknown on the second node.
> >> >
> >> > But this didn't happen. Both nodes had primary drbd-volumes after
> >> > disconnecting link.
> >> >
> >> > Can anyone tell me, why heartbeat or whoever did this?
> >>
> >> Hi,
> >>
> >> I suggest: Each DRBD does not see the other one, thinks the other died and
> >> promotes itself.
> >> Use dopd to prevent this behaviour.
> >
> > Is DRBD able to promote itself? I thought it isn't and you can demote and
> promote it only manually (or via heartbeat or something else...)?!?
>
> Unless you configure drbd to start up as primary on both nodes (e.g.
> to use OCFS2 or another Clusterfilesystem) you have to promote a drbd
> resource manually ... or let it promote e.g. via heartbeat
Yeah, that's exactly what I knew until now. So the problem why both
drbd-instances got promoted isn't really solved? I'll try if dopd prevents
this behaviour, but I still do not know the reason why heartbeat acts this way?
> One potential problem I saw in your cib: if you use the heartbeat
> "drbddisk" RA and not the OCF RA you have to configure positional
> parameters or the drbddisk RA will promote all drbd-resources per
> default.
>
> ... as an example, change:
>
> <nvpair id="drbddisk_afd_resource" name="drbd_resource" value="drbd_afd"/>
>
> ^^^^^^^^^^^^^^^^^^
> ... to:
>
> <nvpair id="drbddisk_afd_resource" name="1" value="drbd_afd"/>
> ^
>
> ... because the first paramter to drbdisk has to be the drbd resource name.
OK, I'll change the config to use the string "1" instead of "drbd_resource".
I hope I understood you right. :)
Thanks
Florian
> Regards,
> Andreas
>
> >
> > So it seems that I was wrong...
> >
> > Well let's repair the broken cluster and configure dopd.
> >
> > Thanks
> > Florian
> >
> >
> >> Michael.
> >>
> >> --
> >> Dr. Michael Schwartzkopff
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> >>
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