Problem with Shared storage (SAN)

Hi,

I have a SAN Storage DX440 S2 system, and two ESXi 5 (two physical servers)

I could assign Disk to single virtual server using LUN disk created on SAN

However, I couldn't create a shared storage (using LUN, Raw Devices Mapping) between two or more servers. After add shared storage to two servers (A and B), I checked up and realized that the servers using separated space. I mean I created a file on shared storage through server A then checked it from B but cannot see that file. And when running the test of building Failover Cluster Microsoft it fails on the cluster disk test.

Please, could you show me steps to create a Shared Storage (SAN) between servers and also quorum disk on SAN and mapping it to ESXi virtual servers ?

Thank you.