# Switch from ra2t to ra3\_pack3 for UM12

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/switch-from-ra2t-to-ra3-pack3-for-um12/2035>\
**Category:** Uncategorized\
**Tags:** ARCHER2, Nesting-Suite\
**Created:** [13 March 2026 16:43 UTC](https://cms-helpdesk.ncas.ac.uk/t/switch-from-ra2t-to-ra3-pack3-for-um12/2035 "2026-03-13T16:43:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![douglowe](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/douglowe/32/74_2.png) [@douglowe](https://cms-helpdesk.ncas.ac.uk/u/douglowe)\
**Post date:** [13 March 2026 16:43 UTC](https://cms-helpdesk.ncas.ac.uk/t/switch-from-ra2t-to-ra3-pack3-for-um12/2035/1 "2026-03-13T16:43:45Z")

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This is a technical, rather than science, question.

I want to change the configuration of my model run from ra2t to ra3\_pack3. I (very vaguely) recall that changing the ‘rg01\_rs01\_m01\_config‘ option in my namelist (in the rosie go GUI) would change the namelist settings for my suite. However I cannot remember how to trigger that process. Can anyone help?

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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:** [12 April 2026 16:44 UTC](https://cms-helpdesk.ncas.ac.uk/t/switch-from-ra2t-to-ra3-pack3-for-um12/2035/2 "2026-04-12T16:44:24Z")

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