Maynor,  No, you do not need FLARE 30.  Shared storage is a common use case and this has been long supported in Navisphere Manager (FLARE 29 and lower) and Unisphere (FLARE 30).  Just configure your storage group(s) in either of the scenarios listed above.
hello using the cx4-120 iscsi ports,  1. can i configure a shared storage using navishere to create a storage group and include on it my 2 esx server, with 1 lun of 500 gigas. in order to use vmotion between host using vcenter.?  2. can configured a shared storage to share a lun between 2 windows 2003 phisical hosts, with microsoft cluster configured?  thank you.  mc.
CX4-120 using iscsi ports - can i setup SHARED STORAGE between 2 esx vsphere 
4.1 hosts