Through the pre-Look at phase of the vCenter update or improve, during the vSphere Customer and logs, you could possibly see an error such as: A exceptional race condition could lead to vCenter to report a successful update as failed. The problem takes place if during vCenter reboot /storage/core unmounts https://pleskmigrationservice49999.wikicommunications.com/4463217/the_smart_trick_of_plesk_migration_service_that_no_one_is_discussing