Dear Gromacs users,

I use Gromacs 4.5.1. The problem relates to the restarting procedure of a run. 
Usually I restart the run with the "-append" option and now I need to move the 
".trr" and ".xtc" files to another directory since they got too big for the 
directory quota where they were located by now. So, previously the restart line 
looked like the following:

mdrun -append -s system.tpr -c system.gro -g system.log -e system.edr -cpi 
system.cpt -cpo system.cpt -o system.trr -x system.xtc

and now after copying (or just moving) the ".trr" and ".xtc" files to a new 
directory the restart line looks like:

dir=new_dir
mdrun -append -s system.tpr -c system.gro -g system.log -e
 system.edr -cpi system.cpt -cpo system.cpt -o ${dir}/system.trr -x 
${dir}/system.xtc

However, in the latter case Gromacs gives the error "output files not present 
or named differently:..." complaining that the ".trr" and ".xtc" files could 
not be found in the location pointed by the checkpoint ".cpt" file. This is 
even when the copy of the original ".trr" and ".xtc" files were left in their 
original directory.

Could anybody point to a solution or a workaround ?

Thanks a lot in advance.


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