Johnny Zhang
ESX 4.0 uses the unique LUN identifiers, typically the NAA (Network Addressing Authority) id. We can find out from the ESX host side if the LUN is unique.

esxcli nmp device list
The device starts with "naa" uses Network Addressing Authority, and it's unique. The one starts with "mpx" does not have a unique ID. In our case this is a local disk. It would be a good idea to make sure we have unique disks when the SAN team persent them to ESX servers.
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