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Tony, I agree with everything that Tom wrote but would like to clarify the possible benefits of multiple pqact(1) processes. The more CPUs/cores you have, the greater the potential benefit up to the point where they begin to compete for resources (CPUs, I/O, etc.). The only way to tell is to try. One question: when "writing to disk" are you using pqact(1)'s FILE action or are you using its PIPE action and it's the decoder that's writing to disk? Regards, Steve Emmerson Ticket Details =================== Ticket ID: ISX-930596 Department: Support LDM Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.