I just did an IP schema change on my vdi environment everything went good upgraded from Horizon 7.4 to 7.6. But I can't delete the old VCenter (it was connected by IP address in horizon) when I try to delete it, it say's I have to delete the pools first. So when I try to delete the pools it can't because it can not connect to the old Vcenter is there a way around that? I need to delete the old vcenter and add the new vcenter to the connection brokers. Thanks.
I think the following blog will help you with your issue.
You must first delete the vcenter connection on all pools in the adam database
Before doing anything, take a backup of the database.
Try running ViewDBChk to see if it will clean-up the ADAM database.
Removing invalid linked clone entries automatically using the ViewDBChk tool in VMware Horizon View 5.3 and later versions (2118050)