Anyone have better idea for load balancing on EC2. Basically I am using two EC2 window instances with separate EBS volume attached to each instance. I know about how to use load balancer and working fine for me. I have only issue with sharing application data between two instance, my application require large number of photo and PDF upload and I want to make sure replicate in both instance. I don't want to use S3 in this case as we need to pass through REST/SOAP protocol only. 

Any idea.

\*Update:
I just updated subject line as it was misleading. I want to sync files between two EBS volume attached to different EC2 instances.