Hi,
Thanks a lot for your replay, I think that you're right.
1. The RDM is in Physical mode with SCSI Controller in Physical Bus Sharing. --> OK
2. The SCSI ID controller should be same on both VMs. --> KO (Here's the problem)
3. As we are using physical bus sharing then both VMs should be on seperate Esxi hosts. --> OK
4. For RDMs the LUN ID of the RDM disk should be same on all Esxi hosts. As the LUN ID component contributes to vml id which is important for RDMs. --> OK
The problem is that on secondary node when they created (It was not me) the SCSI:0 was not created properly with SCSI Bus Sharing "Physical" so I have to use other SCSI instead of SCSI:0...I've just made a test with another disk that can share exactly the same Virtual Device Node and works perfectlly.
Next steps or I reconfigure new disks on primary node (i can't cause we have 48 Disks and don't fit all of them, 15 per SCSI) or I change the SCSI:0 Bus sharing of the secondary node. If i'm not mistaken this last option has to be done with VM powered off.
Thanks a lot for your time and experience I really apreciate