[Pacemaker] Now HOWTO: Dual primary DRBD + OCFS2

[Michael Schwartzkopff]

Am Montag, 14. September 2009 14:11:41 schrieb Diego Remolina:
(...)
> One thing that I believe would really complement the howto is if you
> could explain the configuration for a more complex setup, say two
> separate drbd Primary devices on the same cluster.

You mean r0 and r1? Please see the documentation of linbit for this setup.

> Going from one to two drbd devices is not always obvious and there are
> some location, collocation and order constrains that are not always easy
> to figure out.

???
It is straigt forward. Just make two ms-Resources. No further constraints 
other then the ones provided are needed.

> There are also gotchas depending on how you configure your constrains as
> if you wanted to say bring down one of the filesystems on drbd or only
> one of the resources, but not the other, then depending on how your
> constrains were configured, bringing down only one of the two, can
> actually bring down other services in the cluster.
>
> If you would like any clarification, please let me know.

Well, Perhaps I did not get the point completely. Of course you will make a 
filesystem depending on the state of the DRBD. Other resources depending in the 
mounted data are, of course, also depending on the ms via the filesystem. So if 
I take down the DRBD, the filesystem and the database using the data are also 
brought down.


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Dr. Michael Schwartzkopff
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