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What should be considered when replacing a CIFS shared storage system that has DNS CNAME records and SPNs registered

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Category:
ontap-9
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NAS
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Applies to

ONTAP 9

Answer

  • To replace the current CIFS shared storage without changing the access method, which uses legacy hostnames. 
  • Need to ensure proper DNS and SPN configurations to maintain seamless access.
  1. DNS Configuration:
  • Retain the record for the current host name.
  • Remove the CNAME record pointing from the previous host name to the current host name.
  • Add a new record for the previous host name pointing to the new host's IP address.
  • Example:
    • Current Host Name A Record: Keep as is.
    • Previous Host Name to Current Host Name CNAME Record: Remove.
    • Previous Host Name A Record: Add pointing to New Host IP.
  1. SPN Configuration:
  • Retain the SPN entries for the current host name.
  • Remove the SPN entries for the previous host name.
  • Add new SPN entries for the previous host name pointing to the new host.
  • Example:
    • Current Host Name: Keep as is.
    • Previous Host Name: Remove.
    • New Host Name: Add SPN entries.

Additional Information

  • Ensure that the DNS and SPN changes are properly propagated and verified before decommissioning the old storage.
  • It is recommended to perform these changes during a maintenance window to minimize impact on users.
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