[CentOS] how to convert 7 cd iso images into one dvd image?

> how to convert 7 cd iso images into one dvd image?

Cat the CD ISOs together (order doesn't matter) into a single big file
with the same name as the corresponding DVD (same version and arch),
then run rsync on it to convert into the actual DVD (using a mirror that
has both rsync and the desired DVD). The same trick works in reverse:
for each CD, make a copy of the DVD with the same name as the CD, then
run rsync on it to convert it into the actual CD. In either direction,
the download necessary shouldn't be more than a few percent of full size.

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