vijayku's Accepted Solutions

short answer - no. enhanced linked mode is configured at the time of PSC deployment and can not be reconfigured during the upgrade procedure, however you can deploy a new psc at each site, join these in a single SSO domain and repoint the vCenter to these PSC's. This can be done before or after the upgrade. Steps to be performed are documented here Consolidate SSO Domain before vSphere 6.5 upgrade | CloudVM​ however actual procedure might be different based on the version.

you just need to add the additional disks on the esxi hosts on which the datastore has been mounted. after that just follow the tutorial as per the shared link VMware vSphere 6.5 | How to Increase / Expand Datastore size in VMware ESXi 6.5 | Tutorial Part 10 - YouTube

First disable the IPv6 on the windows host running the vCenter server. PFB for reference. Second do nslookup of the hostname and FQDN of the VCSA hostname and remove any DNS forward or reverse lookup pointing to an IPv6 address.

External PSC deployment in not recommended with 6.7, visit External Platform Services Controller, A Thing of the Past - VMware vSphere Blog  and What's New in vCenter Server 6.7 Update 1 - VMware vSphere Blog for more information.

can you share the output of the following to confirm the stats available for the entity. Get-StatType -Entity (Get-VM -name PCMS) -Interval "Past Day" also can you also confirm the current statistics settings in Administration -> vCenter Server Settings ->Statistics