I just discovered automatic node referrals https://library.netapp.com/ecmdocs/ECMP1366834/html/GUID-0A5772A4-A6D7-4A00-AC2A-92B868C5B3B5.html and I was wondering: could this be used to migrate CIFS workloads from 7-mode to CDOT in a more granular way than the current 7TT? Right now, if I transition a subproject in 7TT, it finishes by removing the IP address from the 7-mode box. This is sensible, because if it didn't, there would be a collision.

This is a problem for me because I am unlikely to be able to find a common outage window for the hundreds of applications that use this IP address for file repositories. Right now, my plan is to schedule an omnibus outage window, and anyone who can't live with that will be welcome to migrate manually ahead of time.

Based on my understanding of how automatic node referrals use DFS referrals, shouldn't it be possible to use this within 7TT? Basically, I am imagining a scenario where a share migration to a CDOT SVM would look like:

-snapmirror volume to CDOT -disconnect clients -final sync -restart share on 7-mode, but now all SMB session requests get DFS redirected to the LIF on CDOT

When all data on 7-mode is migrated, the IP address would be added to the CDOT SVM and the redirection could be stopped (or turned into an automatic node referral setup).

Basil