Last days i was investigating about real difference between NPIV and Virtual SCSI options available on IBM Pseries platform for virtualisation implementation.Unfortunately i could not find that except that if you have a FC based tape library or any other tape device and you want to share it between your Lpars ( which is rear case in today's market as it is captured by enterprise backup solutions like TSM or Veritas which does not require this kind of setup) or when you want to avoid word SCSI in front of your management, you can opt NPIV approach otherwise vscsi approach is well established approach in terms of performance ad reliability.
However , for NPIV , following are minimum requirements:
1. Eight Gig FC Adapater ( NPIV capable)
2. NPIV capable SAN switches
3. VIO 2.1
So rule of thumb is that if you dont have above mentioned luxuries , you can stick to VSCSI approach.
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