Chapter 7. Multipathing and Failover

One of the most critical elements of storage availability in the enterprise is multipathing and failover. ESXi has included native multipathing (NMP) right out of the box since ESX 1.5. Although it does not provide the complex level of input/output (I/O) load balancing that storage vendors’ proprietary Multipathing I/O (MPIO) software provides, NMP does an excellent job maintaining access to the shared storage that the infrastructure uses.

In ESX versions prior to 4.0, the portion of the VMkernel responsible for multipathing and failover was referred to as Legacy Multipathing (Legacy-MP). It was monolithic code built into the VMkernel. Any changes or updates to this code required installing a new version ...

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