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Saturday, 16 November 2013

NPIV Capabilities and Limitations

NPIV supports vMotion. When you use vMotion to migrate a virtual machine it retains the assigned WWN.
If you migrate an NPIV-enabled virtual machine to a host that does not support NPIV, VMkernel reverts to using a physical HBA to route the I/O.
If your FC SAN environment supports concurrent I/O on the disks from an active-active array, the concurrent I/O to two different NPIV ports is also supported.
When you use ESXi with NPIV, the following limitations apply:
Because the NPIV technology is an extension to the FC protocol, it requires an FC switch and does not work on the direct attached FC disks.
When you clone a virtual machine or template with a WWN assigned to it, the clones do not retain the WWN.
NPIV does not support Storage vMotion.
Disabling and then re-enabling the NPIV capability on an FC switch while virtual machines are running can cause an FC link to fail and I/O to stop.