# Restarting to continue HadGEM3 run in cylc8

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967>\
**Category:** Uncategorized\
**Created:** [16 January 2026 13:53 UTC](https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967 "2026-01-16T13:53:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jgrist02](https://avatars.discourse-cdn.com/v4/letter/j/c57346/32.png) [@jgrist02](https://cms-helpdesk.ncas.ac.uk/u/jgrist02)\
**Post date:** [16 January 2026 13:53 UTC](https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967/1 "2026-01-16T13:53:47Z")

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I ran HadGEM3 HH (u-dw047) for a month and would like to continue it from where it finished .

Naively, I thought I could point the restarts to the

Relevant files /folders

/work/n02/n02/jgrist02/cylc-run/u-dw047/run1/share/data/History\_Data/NEMOhist/dw047o\_19500201\_restart\_

Etc in the GUI

And change the model basis time from 1950 01 01 to 1950 02 01

But the error message reads

???

???!!!???!!!???!!!???!!!???!!! ERROR ???!!!???!!!???!!!???!!!???!!!

? Error code: 10

? Error from routine: INITTIME

? Error message:

? Mismatch between model\_basis\_time read from namelist and validity time read

? from dump fixed header.

?

? model\_basis\_time = 1950 2 1 0 0 0

? fixhd validity time = 1950 1 1 0 0 0

?

? If this is intentional disable this check by setting all elements of

? namelist:nlstcall=model\_basis\_time to zero. Otherwise make adjustments to

? either the namelist or dump to ensure that these two values match.

?

? Please note, that if it is valid to do so for your job setup, you may change

? the validity time of the dump using the reconfiguration namelist variables:

? \* namelist:headers=i\_override\_date\_time

? \* namelist:headers=new\_date\_time

?

Could you please direct me to make the necessary changes I should make.

Jeremy

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**Author:** ![RosalynHatcher](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/rosalynhatcher/32/11_2.png) [@RosalynHatcher](https://cms-helpdesk.ncas.ac.uk/u/RosalynHatcher)\
**Post date:** [16 January 2026 16:02 UTC](https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967/2 "2026-01-16T16:02:02Z")

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Hi Jeremy,

All you need to do is to change the run length from 1 month to e.g. 1 year or whatever length you wanted and restart the suite and it will then automatically pick up from where it left off.

To be honest if you’ve only run 1 month, it’ll be easier to just start the run from the beginning again rather than try and fix up what’s gone wrong.

Cheers,  
Ros

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**Author:** ![jgrist02](https://avatars.discourse-cdn.com/v4/letter/j/c57346/32.png) [@jgrist02](https://cms-helpdesk.ncas.ac.uk/u/jgrist02)\
**Post date:** [30 January 2026 11:27 UTC](https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967/3 "2026-01-30T11:27:49Z")

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Hi Ros,

Sorry just want to clarify these steps.

As I’m just getting the first month output again as opposed to a continuation.

What I tried was the following:

I increase ‘Total Run length’ under ‘Run Initialisation and cycle.’

And (as its cylc 8)

export CYLC\_VERSION=8

cylc tui

cylc play u-dw047

from within /home/n02/n02/jgrist02/roses/u-dw047

many thanks,

Jeremy

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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:** [1 March 2026 11:28 UTC](https://cms-helpdesk.ncas.ac.uk/t/restarting-to-continue-hadgem3-run-in-cylc8/1967/4 "2026-03-01T11:28:22Z")

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