[Linux-cluster] Dual node storage cluster without Expensive SAN hardware.

[Jan Hugo Prins]

Hello,

I'm looking into doing the following. I want to create some sort of High 
Available storage cluster without using expensive SAN hardware. Lon 
Hohberger allready told me that this is currently not possible if both 
nodes should be able to write to the storage but now I'm wandering if 
the following is possible and if there is some documentation on how to 
do this properly.

I have 2 nodes, both nodes have a lot of Direct Attached Storage online. 
I would like to create a block device that is essentially a RAID 1 set 
on those 2 storage nodes. Then I would like to use something like 
Heartbeat to determine which node should be the master node and have 
write access and should therefor also export the storage to other 
systems that use this storage to store there data.
Using a single IP that always live on the master node I could then make 
sure that data is available on a single entry point for all nodes that 
need this data.

Is this possible using the GFS / GNBD components currently available in 
FC5 / FC6 or RHEL?

Thanks a lot for your information,
Jan Hugo Prins