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Updated on 7/29/2019
Operations Guides
Check Client Access (Manual Step)
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Check Client Access (Manual Step)

Failure to Complete StepDescription of Impact to FailoverRecovery StepsSpecial Instructions or Warnings
DNS SmartConnect zone validationNote: Dual delegation switches DNS automatically with networking failover available in Access Zone Failover

nslookup SmartConnect  zone name

  1. Confirm the ip address returned is the target cluster ip pool
  2. Repeat for all SmartConnect zones that were failed over
  3. If incorrect then update target cluster by using isi command to create the missing alias on the ip pool
  4. If ip returned is still the source cluster, then rename source cluster SmartConnect zone name to ensure dual delegation will not use this cluster's DNS service to answer queries
 
Refresh session to pick up DNS changeSMB Client unable to access data on  Failover Target cluster despite successful failover and DNS Updates and session refresh

Check SPNs using ADSI Edit tool and confirm that

  1. Failover Source Cluster - SPN for SmartConnect Zone that Client is using does NOT exist.  
  2. Failover Target Cluster - SPN for SmartConnect Zone that Client is using DOES exist.
  3. If above condition is not met, using ADSI Edit to update SPN to be on correct cluster.
You cannot create a missing SPN on the Active Cluster if it still exists for the Failed Over cluster.  You need to remove from Failover Over cluster first and then add to active cluster.
SMB Direct Mount SharesDual delegation updates DNS but requires clients to remount and query DNS to get a new cluster ip address

net use //sharename /delete

net use //sharename

Or use map network drive in Explorer

 
NFS mountsDual delegation updates DNS but requires clients to remount and query dns to get a new cluster ip addressumount -fl /path of mount -a (reads fstab file and remounts, does force and lazy unmount to handle open files) 
DFS clientsauto switchno action needed 

Copyright Superna LLC 2017

Copyright Superna LLC