# Crash in downscaling suite

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/crash-in-downscaling-suite/1878>\
**Category:** Unified Model\
**Tags:** ARCHER2\
**Created:** [20 November 2025 08:56 UTC](https://cms-helpdesk.ncas.ac.uk/t/crash-in-downscaling-suite/1878 "2025-11-20T08:56:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Emanuele\_Gentile](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/emanuele_gentile/32/501_2.png) [@Emanuele\_Gentile](https://cms-helpdesk.ncas.ac.uk/u/Emanuele_Gentile)\
**Post date:** [20 November 2025 08:56 UTC](https://cms-helpdesk.ncas.ac.uk/t/crash-in-downscaling-suite/1878/1 "2025-11-20T08:56:06Z")

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Hi Ros,

This is Ben path

`/home/n02/n02/bharvey/cylc-run/u-dq099_cm655_dd441_19580216-P_uk-02`

And my own

`/home/n02/n02/egentile/cylc-run/u-dq099_cm655_dd441_19580216-P_naew-02`

We got a similar crash despite us running on two different downscaling domain, so maybe an issue with the driving boundary conditions not sure, any help would be greatly appreciate from us both.

I just add that Ben carried out the following tests that didn’t help, just quoting from his email

- Reduce timestep to 30s (set in `opt/rose-suite-CANARI_uk-02.conf:TIMESTEPS_PER_DAY=2880`)
- Turn on extra diagnostic output (set in `app/lm_um/rose-app.conf:PRINT_STATUS=PrStatus_Diag`)
- Change number of processors (set in `opt/rose-suite-CANARI_uk-02.conf:NPROCX=12` [also NPROCY])
- Examine my vegfrac ancil file for obvious NaNs etc (`/work/n02/n02/shared/CANARI/ancils-regional/climate/uk/0p02/time_varying_vegfrac/qrparm.veg.frac`)

Bests,  
Emanuele

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**Author:** ![grenville](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/grenville/32/29_2.png) [@grenville](https://cms-helpdesk.ncas.ac.uk/u/grenville)\
**Post date:** [24 November 2025 10:09 UTC](https://cms-helpdesk.ncas.ac.uk/t/crash-in-downscaling-suite/1878/2 "2025-11-24T10:09:33Z")

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Emanuele

Please allow us read access to your nvme space.

The fact that both uk and naew domains fail for this storm does point to bad start data, but which bit of data is hard to establish. Can you skip this storm for now?

Grenville

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**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/cms_support/original/1X/1fd2411499ffcbc299fe756cd5cdf26e44956558.png) [@system](https://cms-helpdesk.ncas.ac.uk/u/system)\
**Post date:** [24 December 2025 10:10 UTC](https://cms-helpdesk.ncas.ac.uk/t/crash-in-downscaling-suite/1878/3 "2025-12-24T10:10:31Z")

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