# Cylc 8 symlinking work/share dirs

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932>\
**Category:** Rose/Cylc and FCM\
**Created:** [8 December 2025 11:43 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932 "2025-12-08T11:43:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![cemachelen](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/cemachelen/32/55_2.png) [@cemachelen](https://cms-helpdesk.ncas.ac.uk/u/cemachelen)\
**Post date:** [8 December 2025 11:43 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932/1 "2025-12-08T11:43:37Z")

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For some cylc 7 suites that were having issues with large variations in cycle times due to I/O performance, I used to have in my rose-suite.conf

root-dir{share}=ln\*=/mnt/lustre/a2fs-nvme/work/n02/n02/$USER  
root-dir{work}=ln\*=/mnt/lustre/a2fs-nvme/work/n02/n02/$USER

How do I replicate this behaviour in cylc 8? The help message implies I should create a `~/.cylc/global.cylc` file to control this, but I only need this on certain suites.

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**Author:** ![AnnetteOsprey](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/annetteosprey/32/27_2.png) [@AnnetteOsprey](https://cms-helpdesk.ncas.ac.uk/u/AnnetteOsprey)\
**Post date:** [8 December 2025 12:05 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932/2 "2025-12-08T12:05:01Z")

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Hi Helen,

You should use the `archer2-nvme` platform which will set up the symlinks for you. Make sure any tasks in your suite that run on Archer2 use either `archer2-nvme` or `archer2-nvme-bg` as the first task that runs is the one that sets up the symlinks.

See: [https://cms.ncas.ac.uk/cylc8/#platforms](https://cms.ncas.ac.uk/cylc8/#platforms)

Best wishes,

Annette

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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:** [8 December 2025 12:05 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932/3 "2025-12-08T12:05:50Z")

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Helen

See [Cylc 8 on PUMA2 and ARCHER2](https://cms.ncas.ac.uk/cylc8/) - you need to select the appropriate platform.

Grenville

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<div class="post-metadata">

**Author:** ![cemachelen](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/cemachelen/32/55_2.png) [@cemachelen](https://cms-helpdesk.ncas.ac.uk/u/cemachelen)\
**Post date:** [8 December 2025 12:21 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932/4 "2025-12-08T12:21:22Z")

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Thanks, just totally missed!

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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:** [10 December 2025 12:21 UTC](https://cms-helpdesk.ncas.ac.uk/t/cylc-8-symlinking-work-share-dirs/1932/5 "2025-12-10T12:21:45Z")

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