In order to improve the performance and efficient usage of our MARS system, the server produces a warning whenever an inefficient access pattern is detected.
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mars - INFO - 20201216.183255 - The efficiency of your requests in the last 12 hours is 14%. See https://confluence.ecmwf.int/x/rxRtD [marsod-core]
mars - WARN - 20201216.183255 - Please contact ServiceDesk@ecmwf.int to see how to improve the efficiency of your requests [marsod-core]
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A typical inefficient request pattern usually involves repeated access to elements of data which are stored in a single the same file on tape using separate MARS requests. This pattern forces multiple mounts of the tape (which is a very expensive operation for a tape-based mass storage system) that could be avoided if a single combined larger request were to be used.
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