# Model failure

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104>\
**Category:** Unified Model\
**Tags:** ARCHER2\
**Created:** [16 June 2026 09:24 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104 "2026-06-16T09:24:17Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![SimonTett](https://avatars.discourse-cdn.com/v4/letter/s/3da27b/32.png) [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\
**Post date:** [16 June 2026 09:24 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104/1 "2026-06-16T09:24:17Z")

</div>

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: Timestep 20160 Model time: 2011-06-11 00:00:00  
> Error in EM\_FOPEN: Input/output error - /work/y07/shared/umshared/CMIP6\_ANCIL/d  
> ata/ancils/n96e/timeseries\_1850-2014/VolcanicAod/v3/volc\_aer\_extinction\_sw.nc
> 
> ???  
> ?  
> ???!!!???!!!???!!!???!!!???!!! ERROR ???!!!???!!!???!!!???!!!???!!  
> !  
> ? Error code: 34  
> ? Error from routine: EM\_FOPEN  
> ? Error message: NetCDF error (see pe0 output for more details)  
> ? Error from processor: 0  
> ? Error number: 41  
> ???  
> ?

If I ls the file on the frontend file exists. I will go and restart the atmospheric step and hope it was a file system glitch.

Simon

---

<div class="post-metadata">

**Author:** ![jonnyhtw](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/jonnyhtw/32/548_2.png) [@jonnyhtw](https://cms-helpdesk.ncas.ac.uk/u/jonnyhtw)\
**Post date:** [16 June 2026 09:55 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104/2 "2026-06-16T09:55:30Z")

</div>

Hi Simon.

That file is there for me and is openable in `xconv` so presumably a temporary gremlin?

Cheers

Jonny

---

<div class="post-metadata">

**Author:** ![SimonTett](https://avatars.discourse-cdn.com/v4/letter/s/3da27b/32.png) [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\
**Post date:** [16 June 2026 12:29 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104/3 "2026-06-16T12:29:11Z")

</div>

Seems to be running OK now. So looks to have been a file system glitch.

---

<div class="post-metadata">

**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:** [17 June 2026 12:29 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104/4 "2026-06-17T12:29:52Z")

</div>

This topic was automatically closed 24 hours after the last reply. New replies are no longer allowed.