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[Linux-cluster] Disaster recovery setup


I need to setup a 4 nodes cluster for hosting a few database instances.

The main constraint being that this cluster has to be equally distributed on 2 different sites (distance less than 100 km), ie 2 nodes on each site.

The storage being based on 2 FC disk arrays, one on each site, connected thru 2 SAN fabrics for redundancy and failover.

Each database instance runs on one node, a should be able to switch to another in case of machine crash.

I would like to use CLVM with mirror (or mdadm) to give access  each node to both disk arrays (local and distant). 

In case something happens on one site(disaster) , the nodes on the other site should be able to take over the failing nodes by hosting the  databases instances that failed.
My questions concern :

- Quorum: In case of a disaster, the remaining nodes won't have the majority (2 over 4)
- If I use qdisk, on wich site to put it ? the disaster could occur on any site
- CLVM with mirror (or mdadm layer to built on top of it CLVM) is a "supported " setup ?


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