An arrangement, comprising a computer server management system configured to coordinate the usage of a plurality of server computers (104 1, 104 2... 104 18) located in different spaces (132, 134, 136, 138) of at least one data center, the computer server management system being configured to execute virtualization software configured to manage application processing on the plurality of server computers located in the at least one data center; a data management station of a building environmental control system, the data management station operably coupled to controllers, sensors and actuators of the building environmental control system; a data interface between the data management system and the computer server management system; wherein the data management station is configured to - provide at least some data via the data interface to the computer server management data system, - wherein the data management station is configured to calculate a suitability index for each space (132, 134, 136, 138) based on the information coming from the sensors, the suitability index being a function of a respective measured temperature, a respective calculated server load ratio, a respective forecasted server load, a respective pre-cool status and other respective environmental conditions including pressure, humidity, air flow, and to provide the suitability index for each space (132, 134, 136, 138) to the computer server management system, - and wherein, for each space, the suitability index increases inversely as a function of the measured temperature within the space (132, 134, 136, 138), the suitability index rises inversely as a function of the calculated server load ratio of the server computers within the space (132, 134, 136, 138), the suitability index rises inversely as a function of forecasted server load of the server computers within the space (132, 134, 136, 138), the suitability index rises as a function of the pre-cool status of the space (132, 134, 136, 138), in which the space is being pre-cooled in anticipation of an incoming heavy processing load, and with regard to the other environmental measurements including pressure, humidity, air flow, the suitability index increases as their values tend toward optimums, and decreases as those values tend toward unacceptable conditions; - the computer server management system being configured to allocate application processing to server computers of said plurality of server computers depending on the suitability index calculated for each of the spaces. - provide at least some data via the data interface to the computer server management data system, - wherein the data management station is configured to calculate a suitability index for each space (132, 134, 136, 138) based on the information coming from the sensors, the suitability index being a function of a respective measured temperature, a respective calculated server load ratio, a respective forecasted server load, a respective pre-cool status and other respective environmental conditions including pressure, humidity, air flow, and to provide the suitability index for each space (132, 134, 136, 138) to the computer server management system, - and wherein, for each space, the suitability index increases inversely as a function of the measured temperature within the space (132, 134, 136, 138), the suitability index rises inversely as a function of the calculated server load ratio of the server computers within the space (132, 134, 136, 138), the suitability index rises inversely as a function of forecasted server load of the server computers within the space (132, 134, 136, 138), the suitability index rises as a function of the pre-cool status of the space (132, 134, 136, 138), in which the space is being pre-cooled in anticipation of an incoming heavy processing load, and with regard to the other environmental measurements including pressure, humidity, air flow, the suitability index increases as their values tend toward optimums, and decreases as those values tend toward unacceptable conditions; - the computer server management system being configured to allocate application processing to server computers of said plurality of server computers depending on the suitability index calculated for each of the spaces.