[Pacemaker] DRBD User's Guide 1.2.0rc1

Dejan Muhamedagic dejanmm at fastmail.fm
Mon Jun 29 09:10:26 EDT 2009


On Fri, Jun 26, 2009 at 10:32:39AM +0200, Florian Haas wrote:
> Hello everyone,
> A new version of the DRBD User's Guide is up at
> http://www.drbd.org/users-guide. As this version has some major
> additions to the previous release, I've decided to create a release
> candidate this time, before declaring this an "official reference" --
> everyone's feedback is requested and highly encouraged.
> What's new is Chapter 8, "Integrating DRBD with Pacemaker clusters"
> (http://www.drbd.org/users-guide/ch-pacemaker.html). It

This link works, but can't see it in the users-guide url above.

> deals with the new drbd OCF resource agent we are about to release with
> 8.3.2, and how to use it in Pacemaker clusters using the CRM shell.
> Please grab the 8.3.2rc2 tarball if you are willing to test this.

Talked a bit about it to Lars here in Berlin. I'll take a look
once I'm back to business as usual.

> The entire Pacemaker chapter is currently marked as draft, and it is
> still missing a few illustrations. The current plan is to have this
> ready for prime time when DRBD 8.3.2 is released, or shortly thereafter.
> Other changes in this version:
> - Updated Red Hat Cluster Suite examples
> - More info on OCFS2, legacy-style (without Pacemaker)
> - Typo fixes, style fixes, the usual drill.
> Thanks very much in advance to everyone who is to provide feedback and
> suggestions -- they are much appreciated!

	In a DRBD backed cluster, node fencing (STONITH) is not
	necessary, as fencing is achieved through other means at the
	resource level. It is thus safe to disable STONITH in the
	Pacemaker cluster configuration.

I don't think so. The DRBD may be safe, but in case of split
brain or one node down, the other services may get started on
both nodes. I'd still strongly recommend using stonith fencing.
In spite of the warning which follows, I'd still remove the above

On openais.conf, should be better to set the rrp_mode to active,
should have faster recovery. But I still don't know much about
openais. BTW, did you test this with failing links?



> Cheers,
> Florian

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