Issues with your vCSA appliance locking up or crashing due to a full database volume? Before you go too crazy looking at the database itself, or adding more space to the volume, see this bug. After upgrading to vCenter Server Appliance 5.5 Update 2, pg_log file reports this error: WARNING: there is already a transaction in progress (2092127) http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2092127 SSH into vCenter vcenter:/ # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 9.8G 3.7G 5.6G 41% / udev 4.0G 108K 4.0G 1% /dev tmpfs 4.0G 0 4.0G 0% /dev/shm /dev/sda1 ...