Moderator note: Moved to vSphere Storage
The rules for the NMP to be used are typically already defined within ESXi by default. So when you connect the storage array and ESXi discovers it, it should typically be configured correctly. I do recommend validating it of course just to make sure. If it hasn't discovered it correctly you can manually override it by setting a claim rule for the system, you need to do this on each host.
Thanks for the response.
Does ESXI discovers the Storage Mode automatically or we have tell ESXI what mode the Storage array is using via SATP ?
I understand we can ask ESXI to discover Storage but I was not sure it that also entails discovering Storage Mode.
For each storage device managed by NMP, an ESXi host uses a path selection policy (Fixed, Round Robin, Most Recently Used). Just remember the following points:
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- In RR policy if there is an A/P storage, only all active adapter will be selected.
- For MRU policy (default for A/P) if the adapter is unavailable, ESXi automatically will switch to other available adapters and never fails back to the old used adapters even it's recovered from failure.
- But in Fixed policy (default for A/A) after the failed adapter is recovered, ESXi storage traffic will return to it immediately.