# Changes in numbers or allowances ERA5SL?

**URL:** <https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844>\
**Category:** C3S - Datasets and Usage\
**Tags:** era5\
**Created:** [1 May 2025 13:21 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844 "2025-05-01T13:21:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Raoul\_Linnenbank](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/r/278dde/32.png) [@Raoul\_Linnenbank](https://forum.ecmwf.int/u/Raoul_Linnenbank)\
**Post date:** [1 May 2025 13:21 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844/1 "2025-05-01T13:21:47Z")

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For an unknown reason from about the 1st of April, a nightly update for gathering data from ERA5SL has stopped working due to:

> `cost limits exceeded`  
> `Your request is too large, please reduce your selection.`

This even though the same requests have been working for over 5 years now. Have data or limitations by any chance been updated recently?

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**Author:** ![Kevin\_Marsh](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/kevin_marsh/32/368_2.png) [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\
**Post date:** [2 May 2025 14:53 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844/2 "2025-05-02T14:53:35Z")

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Hi, there was a change in the some ERA5 family dataset limits for netCDF requests at the start of April; see here for details:

> [@Limitation change on netCDF ERA5 requests](https://forum.ecmwf.int/t/limitation-change-on-netcdf-era5-requests/12477):
>
> As many users will have already noticed, a change has recently been implemented in some ERA5 datasets with respect to the retrieval of data in NetCDF format versus GRIB format. The native ERA5 data is in GRIB format. When you download the data in NetCDF, additional processing is required which impacts the performance of the system. For this reason, a smaller amount of data in NetCDF can be retrieved rather than in GRIB format. You can check whether your request is within scope using the data d…

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**Author:** ![Raoul\_Linnenbank](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/r/278dde/32.png) [@Raoul\_Linnenbank](https://forum.ecmwf.int/u/Raoul_Linnenbank)\
**Post date:** [6 May 2025 07:37 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844/3 "2025-05-06T07:37:09Z")

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Ah, clear! We’ll be adjusting the requests accordingly.