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Hi David, re: > We are planning on installing LDM on an Amazon Web Services EC2 virtual > server. Can you tell us how many simultaneous users can we support with > a single instance of an LDM server? The number of simultaneous downsteams that can be fed by a single LDM is a function of a number of things like: - speed of the machine's processor(s) - amount of real memory - size of the LDM queue - speed of the outbound network connections - volume of data to be moved - etc. The only practical way of determining how many downstream connections that can be supported is to run stress tests in the environment in which the LDM is installed. That being said, we can tell you that each of the real-server backend nodes of our idd.unidata.ucar.edu IDD relay cluster is handling over 190 downsteam connections, and they can handle more. I know that this is not the kind of answer you were looking for, but hopefully it will help you move forward. Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: ASR-863718 Department: Support LDM Priority: Normal Status: Closed