[Freesurfer] recon all with 7T data

I tried to do surfer reconstruction (version 5.3) collected in SIEMENS 7T, with error: imgreg_4dfp /opt/freesurfer-530/average/711-2C_as_mni_average_305 /opt/freesurfer-530/average/711-2B_as_mni_average_305_mask talsrcimg_g11 none talsrcimg_to_711-2C_as_mni_average_305_t4 1283' failed! status=254. This seems happened for many others. However, the reconstruction worked fine as using data collected from 3T, which means the freesurfer was installed correct, and environment settings are correct as well. Also, the reconstruction on the 7T data can go through using additional parameter: -use-mritotal. My question is how the -use-mritotal parameter would affect final surface? Thanks for providing your input on this. Xiaomin Yue