LUNS disappeared from ESXI when upgrading ONTAP FAS 2552

[Learnerforever]

kindly note that we are facing the following problem:

-We had ONTAP FAS 2552 with version 8.3 release

-Upgrade done to the version 9.1 P20

Problems:

after upgrade we  noticed that the Datastore in our ESXi hosts Disappeared as if there is path issue.

we have contacted NTEAPP engineers they asked to check the vendor side , please if any one faced like this issue and got fixed pleas help.

[Ontapforrum]

Please see this kb, it was a popular known issue related to Brocade defect .  I don't know your environment (switch etc) but give it a try.
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/Hosts_are_unable_to_login_to_FCP_LIF_on_Brocade

Workaround is quite simple though, just bouncing off the LIFs.
::> net int modify -vserver <vserver_name> -lif <lif_name> -status-admin down
::> net int modify -vserver <vserver_name> -lif <lif_name> -status-admin up

[Learnerforever]

Thanks a lot for your reply,tomorrow I will check a d reply..... Thanks a
lot