Spliting 1 large MKV file into 2 smaller MKV files

Lets say you have a 6GB MKV file that you want to split into 2 X 3GB MKV files

mkvtoolnix to the rescue

install mkvtoolnix

yum install mkvtoolnix

once installed cd into the directory that has the file you want to split
lets say the file is called thor.mkv
to split it into 2 files of 3GB each simply type the following.

mkvmerge --split size 3g thor.mkv -o thor1.mkv
hit enter

you will land up with 2 extra files thor1.mkv and thor2.mkv, each 3gb in size (the original file will also still be in the directory