On 2020-10-23 17:56, Chris Murphy wrote:

That's curious, when I mount the server dvd ISO, those files have
different inode numbers.

I can't tell from the isoinfo man page what the numbers in brackets mean.

Even if inodes are different, data blocks can be reused.
The filesystem is readonly so there is no COW complication.

I've tried to have a dir with 9 hardinked copies of a 9MB file.
A simple mkisofs -o ../test.iso gave me a 10MB iso file (instead of >80MB).

Regards.

--
   Roberto Ragusa    mail at robertoragusa.it
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