During the migration of vSphere 6.0 vCenter Server based on Windows to a vCenter Server Appliance 6.5 you may facing issues with EAM and certificate.
Following was logged:
Two actions were performed and the migration successfully finished on the second attempt.
- Replacement of vCenter certificate from a SHA-1 to SHA-256 Cipher
- CleanUp of Migration data. Reduce log and events retention days in vCenter Server
- Shrink Performance Data Retention, will take some hours to release space in db
- Determining DB size and possible futher needed space for PostgreSQL described here: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.upgrade.doc/GUID-DBC82C5C-F9ED-4E0C-B799-5AAEF962E383.html