[DRBD-user] Corosync and DRBD fencing: one or both?

William Seligman seligman at nevis.columbia.edu
Tue Aug 30 17:25:35 CEST 2011

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

On 8/29/11 4:42 PM, Digimer wrote:
> On 08/29/2011 03:36 PM, William Seligman wrote:
>> A general question: I have a Corosync+Pacemaker with DRBD setup on Linux; I'll
>> give the details if it's relevant. Corosync+Pacemaker controls DRBD start, stop,
>> and promotion. I've implemented fencing via STONITH as Corosync resources.
>> I have not put fencing in the drbd.conf file; I was under the impression that
>> Corosync+Pacemaker would take of STONITHing a node if there's a DRBD problem. Is
>> this correct? Or should I have fencing/STONITH configured in both Corosync and
>> drbd.conf?
>> Does the answer change between a primary/secondary versus dual-primary setup?
> You still want to configure fencing, but you can use the
> 'crm-fence-peer.sh' handler. Using this with 'resource-and-stonith' will
> tell DRBD to block I/O until the fence succeeds, preventing it from
> going dual-primary (even if just for the brief moment between fault and
> fence).

I may be dense, but I find the answer ambiguous; perhaps I didn't ask the
question the right way.

Let me ask in a differen way: If I have fencing set up in corosync, and corosync
controls drbd, do I also need fencing in drbd.conf?
Bill Seligman             | Phone: (914) 591-2823
Nevis Labs, Columbia Univ | mailto://seligman@nevis.columbia.edu
PO Box 137                |
Irvington NY 10533 USA    | http://www.nevis.columbia.edu/~seligman/

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