Action 14/03 Talk with Laurence Field to verify the scalability limits of top-level BDII (e.g., how many site level BDII can it support?) Response: The BDII product team provided the following answer: The sensitive scalability aspect of the BDII is the update process. Today's top-level BDIIs contain 367 sites and the update process takes approximately 520s. The algorithm used in the update process has order of n time complexity. Therefore the expected update time can be calculated by multiplying the number of sites by the factor 1.4. From a Quality of Service (QoS) perspective, the update time affects the latency of information collection and hence freshness of information. Previous investigations show that for the majority of information (highly dynamic state data not included), a latency of one hour is sufficient if the desired probably of the information being current is expected to be greater than 0.999.