Add pre-requisite about vserver active-directory limitation

[chjones45]

Page URL

https://docs.netapp.com/us-en/ontap/snapmirror-active-sync/prerequisites-reference.html

Page title

Prerequisites

Summary

This page does not list the pre-requisite that the SVM participating in SM-AS cannot be joined to Active Directory. I'm not talking about a CIFS Server, im talking about being joined as client computer (CLI: vserver active-directory create). This doesn't require a NAS data LIF on the SVM, just requires a SVM Management LIF.

I have encountered this for real with a customer who was serving only LUNs from their SVM and every volume used the UNIX security style. However, the SVM had a single management LIF with no data protocols and was joined to active directory for a domain-tunnel for management AD authentication.

We had to create a new SVM just for the domain tunnel and delete the vserver active-directory configuration on the LUN SVM, then we would convert our snapmirror relationships to to use the automatedFailOver policy.

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