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Netapp Clustered ONTAP 8.3 CIFS issue

Posted on 2016-08-26
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Last Modified: 2016-09-01
We have a CNAME "DOCS" that points to a CIFS Vserver that works fine in PROD.  When In DR mode using a snapmirrored destination that uses the exact same DNS servers, the Win10 or 2012 server clients are not able to access \\DOCS in the DR system, yet the IP \\10.0.50.55 works.  \\DOCS.domain.com.\ [with a period behind the COM] works as well.  Why do IP addresses, FQDN with PERIOD, and A record names work, but the ONE "DOCS" CNAME does not???  Other CNAMES work as well.  Win7 clients do not have any issue in DR system.
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Question by:tcloud
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Expert Comment

by:paulsolov
ID: 41772645
It may be that nebios is not enabled, especially if it's AD integrated.

https://library.netapp.com/ecmdocs/ECMP12452955/html/vserver/cifs/nbtstat.html

-nbt-name <text>] - NBT Name
If you specify this optional parameter, the command displays the NetBIOS name service information only for the specified NetBIOS name.
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tcloud earned 0 total points
ID: 41773030
Issue ended up being SPN conflict between the PROD and DR cifs SVMs because they have different system names.

Scenario #3 resolved my issue:
https://kb.netapp.com/support/index?page=content&id=1013601&actp=search&viewlocale=en_US&searchid=1472309929657
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by:paulsolov
ID: 41773431
Did the KB provided resolve your issue?
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Author Comment

by:tcloud
ID: 41773815
Yes, this stems from having two stand-alone Filers where DR is a Snapmirror destination and the SYSTEM NAME for the Cifs servers have to be unique.  When switching to DR filer, the SPNs point to the PROD system names and need to be updated to point to the DR system names.  I simply removed the SPN pointing to PROD host names and added new ones that point to DR system names and the issue was resolved.  When moving from DR back to PROD, this process has to be reversed.
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Author Closing Comment

by:tcloud
ID: 41779507
KB resolved my issue completely.
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