Geo Clustering SQL Server 2008 R2

you need to start from Data Centers Vendors abilities\distance \Network possibilities
and Windows setup,

for sql 2008 you may consider Mirroring\Logshipping\sql replication\etc.  instead of GeoClustering.
...
You may start from upgrading sql2008 to sql 2012 and use Geo Clustering
via Always On sql 2012 new feature
/ http://technet.microsoft.com/en-us/sqlserver/gg490638.aspx /

SQL Server Multi-Subnet Clustering (SQL Server
http://technet.microsoft.com/en-us/library/ff878716.aspx

if just you need for DR - you may need just Logshipping solution ( http://technet.microsoft.com/en-us/library/ms187103(v=sql.105).aspx )

the project has already been established by geo clustering.

I have 2 nodes on the main site and 2 nodes on the secondary site. The replication of storage is also provided.

What I can not understand so far is how could structure these four nodes.

We were planning to have an active and passive node on the main site and the other two nodes in the same way at the remote site.

What I can not understand is how this solution could work as it would have two main nodes. Or is that only would have a major node on the main site and the other three nodes would be passive?

what are you going to run and A node in each DC?
explain your servers topology

Active means -something will run there-
does it mean 1 site A and 2md site P
and  vice versa?
please clarify

I found a clarify diagram!

http://windowsdummies.blogspot.com/2012/09/part1-4-node-multi-site.html

Check!

very good.
what about my question about how are you going to use these windows A/P Geon nodes for your sql server?
if it was sql 2012 - Always on feature may be not so bad idea to use for these nodes settings
for sql 2008 what is your plan?

I have licenses  of SQL 2008 R2. what is the difference with SQL 2012 Always on?