Up-to a certain number of Degree of freedom calculation in done and calculation is stopped. Is there any way to restart the calculation right from the particular degree of freedom ?
Unfortunately, there is no such option for IBRION=5-8
To calculate phonons for large systems, I would recommend to use Phonopy program with finite-displacement scheme. With this approach it is possible to resume an incomplete calculation.
Nursultan Sagatov But, as I observed sometimes there remains some negative (very less) phonon frequency with finite displacement method. I also increase the supercell size along with KPOINTS.