Looks like this was an oops on my part - I got it pointed out for me that piping from /dev/zero to a filehandle results in a sparse file, which I did not understand and which explains the lack of impact from *that*.
I verified that compressratio reports properly when dumping highly compressible ASCII into a dataset, so, false alarm - sorry 'bout that; closing. ** Changed in: zfs-linux (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1639963 Title: zfs get compressratio returns bogus results To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1639963/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs