Be careful with log drive space when upgrading VCenter. Our adventure last week was a VCenter upgrade that kept growing the VIManage.ldf file until it filled the drive. My solution was to set the Max size of the log file to the drive size -10 GB and temporily add a 2nd Log file to a temporary drive. The total size of both log files eventually reached 130 GB. The correct size for the log file in our VMCenter environment for normal operations seems to be about 30 GB.