This in my scenario:
My Host A is correctly configured and find the iSCSI target and lun on QNAP NAS.
The problem is host B, which with the same configurations, mount the LUN, but excludes them from host A
vSphere A --> iSCSI connector configurated (OR) vSphere B --> iSCSI connector configurated --> LUN OK
vSphere A --> iSCSI connector configurated (AND) vSphere B --> iSCSI connector configurated --> LUN DOWN on vSphere A
vSphere B --> iSCSI connector configurated (AND) vSphere A --> iSCSI connector configurated --> LUN DOWN on vSphere B
My vSphere version is VMware vSphere Hypervisor (ESXi), free version; I do not know if this version enables two hosts to share the same iSCSI target with the same LUN.
It should also work well?