cifs vservers with or without "preferred-dc"? | NetApp | Page 1

cosmic blaze Jun 12, 2023, 6:28 PM

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If exports here can please explain the following:
There are two different types of configurations with cifs/Domain Controllers, vservers has preferred-dc defined, the other doesn't have. Both seems working.

Can you please tell what "preferred-dc" can do for me?
If Preferred DC's IP was not correctly specified, then all CIFS with the vserver won't work, why?

Only vserver with preferred-dc can be shown by the command:
`*> vserver cifs domain preferred-dc showVserver
Domain Name Preferred Domain Controllers

cluster-vserverwithprefeered-dc abc.com 1.1.1.1, 2.2.2.2`

both type of vservers with or without preferred-dc can be shown by the command:
*> vserver cifs domain discovered-servers show

odd hollow Jun 13, 2023, 8:04 AM

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This should help explain the DC discovery modes: https://docs.netapp.com/us-en/ontap/smb-admin/control-domain-controller-discovery-task.html

Manage domain controller discovery

Beginning with ONTAP 9.3, you can modify the default process by which domain controllers (DCs) are discovered. This enables you to limit discovery to your si...

cosmic blaze Jun 14, 2023, 5:56 PM

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As stated below in the doc that you post here, it seems to me that the request will only go to "preferred-dc", if mode parameter is set to none. Then if they were not available for any reasons, ONTAP wouldn't try remaining DC's. Is my understanding correct?

Server discovery is not performed, the SMB server configuration depends only on preferred DCs. To use this mode, you must first define the preferred DCs for the SMB server.

#cifs vservers with or without "preferred-dc"?