The mThe following sections give some information relevant to retrieving data efficiently.
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- 1 file per month of Analysis (1 type of level, all times, levels, and parameters), for example, have a look in the MARS Catalogue for February 2015 model level analysis
- 1 file per Forecast (1 type of level, all steps, levels and parameters), for example, have a look in the MARS Catalogue for 1st February 2015 model level forecast at 12 UTC
- 1 file per Ensemble Forecast (1 type of level, all steps, members, levels and parameters), for example, have a look in the MARS Catalogue for 1st February 2015 pressure level 50 member ensemble at 12 UTC
Different projects have different needs, and therefore these rules may vary. You are encouraged to visit the MARS Catalogue to inspect how much related data a hypercube contains. The description above is the rule, but resources available at certain times might cause to break it, e.g. 1 month of Analysis may be in 2 files because at that particular month the MARS system was short of disk space and data had to be written to tape earlier than desired.
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