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Thursday, 21 August 2014

Multipathing Options for VMFS and NFS Datastores

To maintain a constant connection between a host and its storage, ESXi supports multipathing. Multipathing is a technique that lets you use more than one physical path that transfers data between the host and an external storage device.
In case of a failure of any element in the SAN network, such as an adapter, switch, or cable, ESXi can switch to another physical path, which does not use the failed component. This process of path switching to avoid failed components is known as path failover.
In addition to path failover, multipathing provides load balancing. Load balancing is the process of distributing I/O loads across multiple physical paths. Load balancing reduces or removes potential bottlenecks.
Note
Virtual machine I/O might be delayed for up to sixty seconds while path failover takes place. These delays allow the SAN to stabilize its configuration after topology changes. In general, the I/O delays might be longer on active-passive arrays and shorter on active-active arrays.
To Select the Multipathing Policy for VMFS datastore "Connectivity and Multipathing" option is available:-
Here you can select the multipathing policies from here:-
Select datastore > Manage Tab > Settings
 
To Select the Multipathing Policy for NFS datastore
For NFS Datastores there is no such option called Connectivity and Multipathing and From the same screen we can only check this datastore is connected with how many esxi hosts
Select datastore > Manage Tab > Settings
 
Then to configure multipathing for NFS datastore you need to create vSwitch with multiple NICs and create the VMkernel port on on this vSwitch and go to the properties of the vSwitch and select NIC teaming policy as given in the screenshot.