To the host server the LUN appears and behaves as though it were on a virtual storage subsystem or array instead...
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of being on a shared port. Note that a best practice would still involve LUN or Volume masking from the storage device as well as applicable form of fabric-based zoning for security and isolation. The ability to have multiple servers access multiple LUNs via a shared physical port is not unique; in fact, most all storage subsystems today support some form of shared access beyond simply physically sharing a common storage port via a Fibre Channel switch.
Dig Deeper on SAN technology and arrays
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