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Re: VMWare Path Selection Policy and EMC VMAX

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Hello MikeErter,

First check the compatibility matrix for compatibility.

 

VMware Compatibility Guide: Storage/SAN Search

 

Second when you go deeper you would notice the default suggested policies by VMware for this particular type of storage

 

VMware Compatibility Guide: Storage/SAN Search

 

For example I tool EMC and Symmetrix VMAX with FC as storage and vSphere 5.5 U1 as the OS. So it gives me the default values and what should be set if you use native multipathing, so for that the below was suggestion

 

Attention: Storage partners using ESX 4.0 or later may recommend VMW_PSP_RR for path failover policy for certain storage array models. If desired, contact the storage array manufacturer for recommendation and instruction to set VMW_PSP_RR appropriately.


Unless there is special instruction from Storage Vendor and if you are using the NMP then it should be followed.


To make matters easier ESXi always selects the default suggested one from VMware so if you are selecting the NMP then go ahead with the default policy that it selects. Shouldn't be any problem in that (unless special requirement from Storage Vendor).


For details check:

vSphere Storage Guide

Chapter 23: Understanding Multipathing and Failover  


vSphere 5.5 Documentation Center


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