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MARS extracts sub areas by retrieving the global grid and cropping the area and returning the requested area.
MARS as a separate service also has constraints on its workload and has separate QOS limits that apply to jobs for data as it is a service shared across Operational services 'ie producing ERA5 and GloFAS' and non operational services such as the CDS.
The CDS service, from time to time, can experience periods of high user activity and increasing queuing time for even small requests. In these times we ask you to kindly wait for the queue to be processed as there are fixed slots available that cannot be increased.
The Figure -1 shows a period of high user activity. GloFAS and EFAS products are served by the adaptor.mars.external service, you can see that the active users (blue line) is well above the green line of 50 slots allocated to the GLoFAS and EFAS requests. When the blue line falls again below the green line then the total queued users start decreasing until eventually there is no queuing time for any user request.
Figure - 1
CEMS-Flood data on MARS
Table 1 -
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