In short its OK to enable that feature when you know that it's safe for multiple servers to concurrently connect to that volume.  I.e.  1.)  Clusters, regardless of the OS.   2.)  When a global file system is in place  (GFS, VMFS, Ibrix, etc)  The purpose of this checkbox is to prevent the accidental double mounting of volumes by different servers.  I.e.  SQL server and a back up server.   Unfortunately, some people believe that the SAN works like a NAS, and that's there a hidden method to keep all the data intact, like a file share.     -don     
Hi everyone, Has anybody create a volume from an equallogic array for the purpose to use it as storage for an Oracle RAC? Equallogic documentation says that “Allow simultaneous connections from initiators with different IQNs” configuration is only valid for Windows failover cluster, so it can’t be used with Oracle cluster? Guillermo.  
Equalogic volume for Oracle RAC