[DRBD-user] Device monitor script for drbd-0.7.x

Lars Marowsky-Bree lmb at suse.de
Wed Sep 15 18:25:36 CEST 2004

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

(Sorry, forgot to Cc drbd-user on first try...)

On 2004-09-15T19:02:16,
   Shallyee Shang <shallyee.shang at jp.sony.com> said:

> > The full logic which side of the two you might want to promote to
> > primary is somewhat more complex, in particular if they are internally
> > split...
> Yes, I can imagine that the logic may not that simple. I think probe
> is import for a really used cluster, don't the experts over there plan to
> privide such functions?

Sure. Monitoring resources will be included in the next major version of
heartbeat, due out in beta stage or even RC status end of this year.

Right now, you can already try exciting alpha versions which will eat
your data if you are so inclined though ;-)

But, _correctly_ monitoring a resource (and then doing something
sensible about it) such as drbd, which can be in multiple states, has
interesting implications and it's not entirely obvious how to do it
best. I recently posted a longish text about it which you can read in
the linux-ha-dev archives (if you aren't subscribed), and the Linux HA
Wiki at wiki.trick.ca/linux-ha also has two pages on
MultipleIncarnationResources and MultiStateResources.

> > With what cluster manager are you trying to integrate drbd?
> I am planning to try heartbeat and MatrixHA.
> Heartbeat has no buildin resource monitor, I am considering mon
> from http://www.kernel.org/software/mon/.

Sounds good. Depending on your timelines, the next major version may be
better suited to your plans; however, I'm just trying to acquire more
testers and developers, so don't mind me too much ;-)

    Lars Marowsky-Brée <lmb at suse.de>

High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX AG - A Novell company

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