[Linux-cluster] Disaster recovery setup

[brem belguebli]

Hello,
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 ?

Regards
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