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The directory t21test contains a number of files:

% ls t21test
ICMGGepc8ICMGGepc8INIT      ICMGGepc8INIUA  ICMSHepc8INIT  ifsdatajob  namelists
ICMGGepc8INIT  ICMSHepc8    ref_021_0072
ICMGGepc8INIUA  ifsdata/ README      namelists   job      ref_021_0144run.ppn

Files beginning with 'ICM'.
These are the input files for this T21 experiment. They are in GRIB format. Do not move them from this directory. OpenIFS expects to find its input files in the same directory as the main executable.

epc8              - this is the Experiment ID. Experiments IDs are used at ECMWF and initial conditions provided by ECMWF will always have an expt id.
ICMGGepc8  - 'GG' indicates these contain gridpoint fields.
ICMSHepc8  - 'SH' indicates these contains spherical harmonic fields.

job
Simple shell Shell script to run the model. Described in more detail below.

run.ppn
Simple shell script which calls job in an interactive shell environment

ifsdata
Climate data fields used for T21 test integration. You should not move or rename this directory as the model will expect to find the climate files it needs in a directory of this name.

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The model fails. Look in the NODE_001.01 file and find the subroutine traceback. Near the top of the traceback you will find the error messages.

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