# Unified Model **URL:** https://cms-helpdesk.ncas.ac.uk/c/unified-model/5.md?page=1 [Latest](https://cms-helpdesk.ncas.ac.uk/latest.md) · [Categories](https://cms-helpdesk.ncas.ac.uk/categories.md) · [Tags](https://cms-helpdesk.ncas.ac.uk/tags.md) **Page:** 2 --- ## [Model failure](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 2\ **Last updated:** [16 June 2026 12:29 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104 "2026-06-16T12:29:11Z")
I had an I/O failure while the model was trying to read a netcdf file. Failure message was (from /home/n02/n02/tetts/cylc-run/dfols46p\_4/dq007/work/20110601T0000Z/atmos\_main/pe\_output/dq007.fort6.pe0) was: Atm\_Step: T… --- ## [Lib-4171 : UNRECOVERABLE library error](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error/2095)
**Author:** [@penmaher](https://cms-helpdesk.ncas.ac.uk/u/penmaher)\ **Replies:** 10\ **Last updated:** [5 June 2026 12:08 UTC](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error/2095 "2026-06-05T12:08:52Z")
Morning CMS team, I am in the process of testing my suite u-dt414. Up until now I have only been running for a few months. I have attempted to run a 5 year test and the model is failing after completing 10 months. The s… --- ## [UM suite failing to submit in Puma2-Archer2](https://cms-helpdesk.ncas.ac.uk/t/um-suite-failing-to-submit-in-puma2-archer2/2093)
**Author:** [@timmyf](https://cms-helpdesk.ncas.ac.uk/u/timmyf)\ **Replies:** 4\ **Last updated:** [2 June 2026 21:11 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-suite-failing-to-submit-in-puma2-archer2/2093 "2026-06-02T21:11:40Z")
Hi, I was trying to run a UM12.0 suite after a gap of some two months in Puma2 - Archer2. Initially I had to follow the instructions in Restarting after puma2 reboot But after that I am getting error “submit-failed”. I… --- ## [V8.4 GA4 UM-UKCA ARCHER2 job seg-faulting, but runs OK with debug option on cce compiler (but obviously very slowly with debug and O0)](https://cms-helpdesk.ncas.ac.uk/t/v8-4-ga4-um-ukca-archer2-job-seg-faulting-but-runs-ok-with-debug-option-on-cce-compiler-but-obviously-very-slowly-with-debug-and-o0/2012)
**Author:** [@gmann](https://cms-helpdesk.ncas.ac.uk/u/gmann)\ **Replies:** 5\ **Last updated:** [2 June 2026 19:38 UTC](https://cms-helpdesk.ncas.ac.uk/t/v8-4-ga4-um-ukca-archer2-job-seg-faulting-but-runs-ok-with-debug-option-on-cce-compiler-but-obviously-very-slowly-with-debug-and-o0/2012 "2026-06-02T19:38:02Z")
Dear NCAS-CMS helpdesk, Further to CMS helpdesk message last week, I am running an extra set of simulations with the interactive stratospheric aerosol configuration of GA4 UM-UKCA, The reason we’re running “the old” G… --- ## [Found cause of the ARCHER2 UMv8.4 GA4 UM-UKCA seg-fault -- now runs fine (JULES routine "snow.F90")](https://cms-helpdesk.ncas.ac.uk/t/found-cause-of-the-archer2-umv8-4-ga4-um-ukca-seg-fault-now-runs-fine-jules-routine-snow-f90/2094)
**Author:** [@gmann](https://cms-helpdesk.ncas.ac.uk/u/gmann)\ **Replies:** 0\ **Last updated:** [2 June 2026 17:04 UTC](https://cms-helpdesk.ncas.ac.uk/t/found-cause-of-the-archer2-umv8-4-ga4-um-ukca-seg-fault-now-runs-fine-jules-routine-snow-f90/2094 "2026-06-02T17:04:01Z")
Dear NCAS-CMS helpdesk, Just to post an update to the post I raised in February re: seg-fault in the GA4 UM-UKCA ARCHER2 job. I’ve put the link to that post below for info, but in summary the model ran when compiled wi… --- ## [U-dz360 user-defined STASHmaster file incorporation](https://cms-helpdesk.ncas.ac.uk/t/u-dz360-user-defined-stashmaster-file-incorporation/2091)
**Author:** [@eewz](https://cms-helpdesk.ncas.ac.uk/u/eewz)\ **Replies:** 3\ **Last updated:** [1 June 2026 15:58 UTC](https://cms-helpdesk.ncas.ac.uk/t/u-dz360-user-defined-stashmaster-file-incorporation/2091 "2026-06-01T15:58:08Z")
Dear helpdesk, I now have an updated STASHmaster\_A file to include new ancillaries. Although I’ve pointed STASHMASTER to the directory containing this new STASHmaster\_A (under app/um/file/STASHmaster/STASHmaster\_A), the… --- ## [U-dw272 running issue during self study](https://cms-helpdesk.ncas.ac.uk/t/u-dw272-running-issue-during-self-study/2090)
**Author:** [@LuckyZhang](https://cms-helpdesk.ncas.ac.uk/u/LuckyZhang)\ **Replies:** 2\ **Last updated:** [28 May 2026 11:30 UTC](https://cms-helpdesk.ncas.ac.uk/t/u-dw272-running-issue-during-self-study/2090 "2026-05-28T11:30:02Z")
Dear CMS team, I am currently working on the self-study practice by following the UM introduction file I received during the training course in Leeds. I am currently on 6.4.1. Check out and run the suite. Since I follow… --- ## [Failure from atmos\_main](https://cms-helpdesk.ncas.ac.uk/t/failure-from-atmos-main/2068)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 4\ **Last updated:** [11 May 2026 07:53 UTC](https://cms-helpdesk.ncas.ac.uk/t/failure-from-atmos-main/2068 "2026-05-11T07:53:13Z")
Hi, I had my last atmos\_main job in my workflow fail because it ran out of time. But looking at the output it had already completed and wrote data out about 40 mins before it ran out of time. Output can be found in /hom… --- ## [Error message: ndiagp is too small to read in STASHmaster](https://cms-helpdesk.ncas.ac.uk/t/error-message-ndiagp-is-too-small-to-read-in-stashmaster/2076)
**Author:** [@mollymac](https://cms-helpdesk.ncas.ac.uk/u/mollymac)\ **Replies:** 1\ **Last updated:** [6 May 2026 08:50 UTC](https://cms-helpdesk.ncas.ac.uk/t/error-message-ndiagp-is-too-small-to-read-in-stashmaster/2076 "2026-05-06T08:50:41Z")
Hi, I am getting the following error at atmos\_main running suite u-dz121: It is a nudged suite running with the DEST chemistry scheme with a new branch to include iodine chemistry. Would somebody be able to explain… --- ## [Increasing vertical resolution from 70\_40 to 120\_40 running on Monsoon3](https://cms-helpdesk.ncas.ac.uk/t/increasing-vertical-resolution-from-70-40-to-120-40-running-on-monsoon3/2063)
**Author:** [@siddharth.gumber](https://cms-helpdesk.ncas.ac.uk/u/siddharth.gumber)\ **Replies:** 0\ **Last updated:** [24 April 2026 02:07 UTC](https://cms-helpdesk.ncas.ac.uk/t/increasing-vertical-resolution-from-70-40-to-120-40-running-on-monsoon3/2063 "2026-04-24T02:07:56Z")
Hello My nesting suite u-dx530 runs fine with 70\_40km config but when I increase the vertical resolution to 120\_40km for my nesting domains - I get the following error: Also I changed my domain profile to output on mod… --- ## [Postproc\_nemo\_grid failure with unhelpful error](https://cms-helpdesk.ncas.ac.uk/t/postproc-nemo-grid-failure-with-unhelpful-error/2057)
**Author:** [@earbsn](https://cms-helpdesk.ncas.ac.uk/u/earbsn)\ **Replies:** 4\ **Last updated:** [20 April 2026 08:10 UTC](https://cms-helpdesk.ncas.ac.uk/t/postproc-nemo-grid-failure-with-unhelpful-error/2057 "2026-04-20T08:10:34Z")
/work/n02/n02/earbsn/cylc-run/ka414\_high\_melt\_grn/run3 Hi, My suite has failed 50 years in with a postproc\_nemo\_grid error. The simulation keeps running for multiple years after and then fails at the coupled step. I h… --- ## [Replacing a field in a dump file with the equivalent field from another dump file](https://cms-helpdesk.ncas.ac.uk/t/replacing-a-field-in-a-dump-file-with-the-equivalent-field-from-another-dump-file/2046)
**Author:** [@scottan32](https://cms-helpdesk.ncas.ac.uk/u/scottan32)\ **Replies:** 10\ **Last updated:** [16 April 2026 15:12 UTC](https://cms-helpdesk.ncas.ac.uk/t/replacing-a-field-in-a-dump-file-with-the-equivalent-field-from-another-dump-file/2046 "2026-04-16T15:12:50Z")
Hello, I want to replace the soil moisture field from the start dump of one of our simulations (u-ds882), which uses UM vn13.0, with the start dump from another simulation (bb055) which used vn10.8. I’m having problems c… --- ## [Sumit-failed 'Job violates accounting/QOS policy'](https://cms-helpdesk.ncas.ac.uk/t/sumit-failed-job-violates-accounting-qos-policy/2038)
**Author:** [@mollymac](https://cms-helpdesk.ncas.ac.uk/u/mollymac)\ **Replies:** 5\ **Last updated:** [8 April 2026 13:01 UTC](https://cms-helpdesk.ncas.ac.uk/t/sumit-failed-job-violates-accounting-qos-policy/2038 "2026-04-08T13:01:26Z")
Hi, All my jobs are going straight to ‘submit-failed’ In ‘cylc-run/u-dx817/log/job/20100501T0000Z/postproc/NN/job-activity.log’: (ln03) 2026-03-16T18:54:39Z \[STDERR\] sbatch: error: AssocMaxCpuMinutesPerJobLimit (ln03… --- ## [Runnable GA7.1 suite on ARCHER2](https://cms-helpdesk.ncas.ac.uk/t/runnable-ga7-1-suite-on-archer2/2045)
**Author:** [@an25872](https://cms-helpdesk.ncas.ac.uk/u/an25872)\ **Replies:** 2\ **Last updated:** [31 March 2026 13:09 UTC](https://cms-helpdesk.ncas.ac.uk/t/runnable-ga7-1-suite-on-archer2/2045 "2026-03-31T13:09:58Z")
Hi all, I’m looking for a runnable atmosphere-only GA7.1 suite (UM vn10.7) at N96L85 resolution, with GL7.0 land, on ARCHER2. This will be used as a starting point for setting up an atmosphere-only paleoclimate configur… --- ## [Permission denied Error during SAm\_4km\_RA2T\_um\_surf\_ostia step](https://cms-helpdesk.ncas.ac.uk/t/permission-denied-error-during-sam-4km-ra2t-um-surf-ostia-step/2040)
**Author:** [@scottan32](https://cms-helpdesk.ncas.ac.uk/u/scottan32)\ **Replies:** 3\ **Last updated:** [20 March 2026 15:24 UTC](https://cms-helpdesk.ncas.ac.uk/t/permission-denied-error-during-sam-4km-ra2t-um-surf-ostia-step/2040 "2026-03-20T15:24:39Z")
I am running suite u-dx731 on ARCHER2, which is itself a copy of u-ds822, which runs fine on my colleagues’ setup. When I run u-dx731, I get the following error during the SAm\_4km\_RA2T\_um\_surf\_ostia step of the workflow… --- ## [Cannot log into ARCHER2](https://cms-helpdesk.ncas.ac.uk/t/cannot-log-into-archer2/2033)
**Author:** [@emxin](https://cms-helpdesk.ncas.ac.uk/u/emxin)\ **Replies:** 2\ **Last updated:** [16 March 2026 10:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/cannot-log-into-archer2/2033 "2026-03-16T10:34:59Z")
Hi there, I could not log into my ARCHER2 account (emxin) due to “Permission denied (publicly)”. Should I regenerate a public key, or is this due to something else, such as my SURFEIT project being very close to the end… --- ## [UKCA top boundary](https://cms-helpdesk.ncas.ac.uk/t/ukca-top-boundary/2031)
**Author:** [@hannahbryant](https://cms-helpdesk.ncas.ac.uk/u/hannahbryant)\ **Replies:** 1\ **Last updated:** [11 March 2026 16:57 UTC](https://cms-helpdesk.ncas.ac.uk/t/ukca-top-boundary/2031 "2026-03-11T16:57:02Z")
Hi! I was hoping to ask a clarification of i\_ukca\_topboundary (at vn12.0). I am running with this set to 2 (rewrite all species at the top level with the level below, following: https://code.metoffice.gov.uk/trac/um/wik… --- ## [Error “WRITHEAD: Addressing conflict” when running GC5 with GC3 restart dump on MONSOON3](https://cms-helpdesk.ncas.ac.uk/t/error-writhead-addressing-conflict-when-running-gc5-with-gc3-restart-dump-on-monsoon3/2028)
**Author:** [@an25872](https://cms-helpdesk.ncas.ac.uk/u/an25872)\ **Replies:** 4\ **Last updated:** [11 March 2026 11:21 UTC](https://cms-helpdesk.ncas.ac.uk/t/error-writhead-addressing-conflict-when-running-gc5-with-gc3-restart-dump-on-monsoon3/2028 "2026-03-11T11:21:36Z")
Hi all, I am currently trying to set up a paleoclimate suite of the HadGEM3-GC5 model on MONSOON3. To save spin-up time, I attempted to run the GC5 suite using the restart dump from a GC3 paleo suite that has already co… --- ## [Partial sum file inconsistent error](https://cms-helpdesk.ncas.ac.uk/t/partial-sum-file-inconsistent-error/2013)
**Author:** [@mollymac](https://cms-helpdesk.ncas.ac.uk/u/mollymac)\ **Replies:** 3\ **Last updated:** [23 February 2026 16:47 UTC](https://cms-helpdesk.ncas.ac.uk/t/partial-sum-file-inconsistent-error/2013 "2026-02-23T16:47:39Z")
Hello, My run u-dx174 is failing after running for a few months at atmos\_main with error: Could anyone explain why this might be? Thank you, Molly --- ## [Job failure](https://cms-helpdesk.ncas.ac.uk/t/job-failure/2000)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 21\ **Last updated:** [21 February 2026 15:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/job-failure/2000 "2026-02-21T15:34:03Z")
Hi, Sorry to bother you, but I submitted 2 jobs last week (u-dw696 and u-dw704), both of which should have run for 20 years. But both of which seem to have failed at exactly the same point, in year 4, at the coupled st… --- ## [Problem with fcm\_make2\_um](https://cms-helpdesk.ncas.ac.uk/t/problem-with-fcm-make2-um/2003)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 1\ **Last updated:** [19 February 2026 12:19 UTC](https://cms-helpdesk.ncas.ac.uk/t/problem-with-fcm-make2-um/2003 "2026-02-19T12:19:20Z")
Hi, Sorry to bother you, but I have a problem with fcm\_make2\_um, which did not happen last time I tried to work on this, just last week. My suite is u-do321. Looking at the job.err, it appears to have run out of time.… --- ## [Problem submitting v8.4 GA4 UM-UKCA job to ARCHER2 from PUMA2](https://cms-helpdesk.ncas.ac.uk/t/problem-submitting-v8-4-ga4-um-ukca-job-to-archer2-from-puma2/2004)
**Author:** [@gmann](https://cms-helpdesk.ncas.ac.uk/u/gmann)\ **Replies:** 5\ **Last updated:** [18 February 2026 01:45 UTC](https://cms-helpdesk.ncas.ac.uk/t/problem-submitting-v8-4-ga4-um-ukca-job-to-archer2-from-puma2/2004 "2026-02-18T01:45:07Z")
Dear NCAS CMS helpdesk team, In August 2024 I ran the interactive volcanic aerosol configuration of GA4 UM-UKCA (Dhomse et al., 2020) for the main set of simulations for Hunga Tonga MIP organised by Univ Colorado. Ther… --- ## [Trouble with pptransfer](https://cms-helpdesk.ncas.ac.uk/t/trouble-with-pptransfer/1992)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 12\ **Last updated:** [13 February 2026 11:39 UTC](https://cms-helpdesk.ncas.ac.uk/t/trouble-with-pptransfer/1992 "2026-02-13T11:39:46Z")
Hi, Sorry to bother you, but I am having trouble with my pptransfer. I get the following error message in my job.err: \[WARN\] Transfer command failed: globus transfer --format unix --jmespath ‘task\_id’ --recursive --f… --- ## [Ancil file error](https://cms-helpdesk.ncas.ac.uk/t/ancil-file-error/1981)
**Author:** [@hannahbryant](https://cms-helpdesk.ncas.ac.uk/u/hannahbryant)\ **Replies:** 20\ **Last updated:** [12 February 2026 11:10 UTC](https://cms-helpdesk.ncas.ac.uk/t/ancil-file-error/1981 "2026-02-12T11:10:57Z")
Hi! I am converting a job to a 2014 timeslice and keep getting the following error: ? Error code: 202 ? Error from routine: UP\_ANCIL ? Error message: REPLANCA: PP HEADERS ON ANCILLARY FILE DO NOT MATCH ? Error fr… --- ## [Re-running UKESM suites archiving issue](https://cms-helpdesk.ncas.ac.uk/t/re-running-ukesm-suites-archiving-issue/1997)
**Author:** [@andreadittus](https://cms-helpdesk.ncas.ac.uk/u/andreadittus)\ **Replies:** 1\ **Last updated:** [6 February 2026 16:49 UTC](https://cms-helpdesk.ncas.ac.uk/t/re-running-ukesm-suites-archiving-issue/1997 "2026-02-06T16:49:39Z")
Hello CMS Team, I have discovered a slightly complicated issue which may be a combination from some CYLC8 changes and recently discovered UKESM1.2 bug issue, requiring re-running of model simulations. I am re-runnin… --- ## [Deadlock in coupled task when porting GC3.1 from ARCHER2 to MONSOON3](https://cms-helpdesk.ncas.ac.uk/t/deadlock-in-coupled-task-when-porting-gc3-1-from-archer2-to-monsoon3/1996)
**Author:** [@an25872](https://cms-helpdesk.ncas.ac.uk/u/an25872)\ **Replies:** 3\ **Last updated:** [3 February 2026 10:10 UTC](https://cms-helpdesk.ncas.ac.uk/t/deadlock-in-coupled-task-when-porting-gc3-1-from-archer2-to-monsoon3/1996 "2026-02-03T10:10:08Z")
Hi all, Recently, I have been trying to port the GC3.1 suite (u-di622) from ARCHER2 to MONSOON3. I spent quite a long time setting up the sources and made some modifications to the source code to fix inconsistencies bet… --- ## [Multiple failures from save\_wallclock.sh](https://cms-helpdesk.ncas.ac.uk/t/multiple-failures-from-save-wallclock-sh/1989)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 2\ **Last updated:** [26 January 2026 12:15 UTC](https://cms-helpdesk.ncas.ac.uk/t/multiple-failures-from-save-wallclock-sh/1989 "2026-01-26T12:15:06Z")
I’ve had a bunch of failures of the form (I am running 10 jobs at once; all failed): /work/n02/n02/tetts/cylc-run/opt\_dfols46/dn00u/bin/save\_wallclock.sh: /work/n02/n02/tetts/cylc-run/opt\_dfols46/dn00u/bin/iteration\_bin… --- ## [Gotchas within converting to post-2015 for nudged MONSOON3 v13.9 UKESM1.1 AMIP runs](https://cms-helpdesk.ncas.ac.uk/t/gotchas-within-converting-to-post-2015-for-nudged-monsoon3-v13-9-ukesm1-1-amip-runs/1975)
**Author:** [@gmann](https://cms-helpdesk.ncas.ac.uk/u/gmann)\ **Replies:** 1\ **Last updated:** [25 January 2026 14:22 UTC](https://cms-helpdesk.ncas.ac.uk/t/gotchas-within-converting-to-post-2015-for-nudged-monsoon3-v13-9-ukesm1-1-amip-runs/1975 "2026-01-25T14:22:02Z")
Dear NCAS-CMS Helpdesk folks, This is just to post email-exchange that flags some “gotcha” glitches that people may encounter when converting the standard MONSOON v13.9 UKESM1.1 AMIP suite (u-ds836) to 2015+ It’s in t… --- ## [Negative Tracer Values#2](https://cms-helpdesk.ncas.ac.uk/t/negative-tracer-values-2/1986)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 2\ **Last updated:** [24 January 2026 17:36 UTC](https://cms-helpdesk.ncas.ac.uk/t/negative-tracer-values-2/1986 "2026-01-24T17:36:22Z")
I got a failure in running an atmospheric simulation: (ModelOptimisation) tetts@ln03:/work/n02/shared/tetts/OptClim\_UKESM\> more /home/n02/n02/tetts/cylc-run/opt\_dfols46/dn00h/work/20110901T0000Z/atmos\_main/pe\_output/dn0… --- ## [UM13.9 running AMIP for 1Y1M and last month output is missing on MASS](https://cms-helpdesk.ncas.ac.uk/t/um13-9-running-amip-for-1y1m-and-last-month-output-is-missing-on-mass/1983)
**Author:** [@meghnasoni](https://cms-helpdesk.ncas.ac.uk/u/meghnasoni)\ **Replies:** 4\ **Last updated:** [23 January 2026 10:23 UTC](https://cms-helpdesk.ncas.ac.uk/t/um13-9-running-amip-for-1y1m-and-last-month-output-is-missing-on-mass/1983 "2026-01-23T10:23:41Z")
Hello, My Gregorian nudged suite u-dw372 has completed successfully. The run was configured for 1Y1M, covering December 2019 to December 2020. However, the December 2020 output is missing from the apm.pp file. There ar… [Previous page](https://cms-helpdesk.ncas.ac.uk/c/unified-model/5.md) [Next page](https://cms-helpdesk.ncas.ac.uk/c/unified-model/5.md?page=2)