On 13/02/14 05:09 AM, Roberto Munoz Gomez wrote:
-----Digimer <[email protected]> escribió: -----
Para: Roberto Munoz Gomez/ES/DIA/DIAGROUP@DIAGROUP,
[email protected]
De: Digimer <[email protected]>
Fecha: 12/02/2014 20:47
Asunto: Re: [DRBD-user] Avoid blocking IO when node fails
On 12/02/14 11:34 AM, Roberto Munoz Gomez wrote:
Hi,
I have configured an Active/Active cluster with Dual Primary DRBD.
All works fine and fast.
But when a node fails, the DRBD status goes to WFConnection and all
IO is blocked on the other node. In this scenario I need the survivor
to continue using the DRBD partition. It would be great if when the
other node comes back, the synchronization begins automatically and
both become Primary automatically.
I have search the doc and google, but have not found any of this.
Only the ko-count option, but does not seem to make a difference.
Any ideas?
Thanks in advance.
Regards.
You need fencing to safely proceed after a node loss. Are you using
cman
or pacemaker? If so, you can setup fencing in those (pacemaker calls
it
stonith, same thing) and then hook DRBD into it.
I'm using pacemaker and corosync. The fencing device is working correctly and
is configured with:
handlers {
fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh";
}
The problem is that while the other node is being fenced, the active one cannot
access the DRBD and all the IO calls are blocked until the fenced node comes
alive again. And that is what I want to avoid. I want the survival node to
continue working.
Do you have stonith configured and working in pacemaker? If not, this
config won't work. The fence handlers simply pass the fence request to
stonith and won't return success until/unless pacemaker says the fence
succeeded.
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
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