Paul Robichaux commented on Geoclustering in last week's edition of the Exchange and Outlook Update. He points out that it can be quite expensive, but that it can also be a very good (and this is key: Supported/Tested) way to span your Exchange servers across multiple sites to prepare for disaster avoidance.

There was some discussion in the comments area of a previous message on this blog about some alternate ways to do “hotspare”-type disaster recovery environments as a method of avoiding the costs and limitations of geospan clustering. There's still some internal investigations going on about just what non-standard sorts of recovery environments can be supported by Microsoft PSS, so that comment thread isn't really totally dead yet, I suppose.

That said, I'm curious to hear from you in the comments: What sort of geo-clustering or clustered-Exchange disaster-recovery concerns do you have that affect your planning of these scenarios?