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Limits:

• You can have a maximum of three active requests at a time and 20 "queued" requests.
• The maximum data volume is 20GB 30GB per request.
• The maximum number of fields to be retrieved is 600,000 fields per request.
  
  

Data tapes and retrieval efficiency:

To retrieve data efficiently (and get your data quicker!) you should retrieve all the data you need from one tape, then from the next tape, and so on. In most cases, this means retrieving all the data you need for one month, then for the next month, and so on. To find out what data is available on each tape, browse the ERA-Interim data catalogue and make your way until the bottom of the tree archive (where parameters are listed). Once you will have reached that level of the archive, what you see is what you can find on one single tape. See Retrieval efficiency page for more details and additional ERA-Interim script examples (e.g. daily and monthly means).