And just to be 100% sure zero's are really on the disk (and not only in cache),I do not know about such tools, but know the trick how to do it:Are there any tools in portage that do this? I had a quick look, but I can't really find one. I mainly want this for use in a vmware gentoo install, to minimize the size of a compressed image.
just write a file full of zeros (as root) to the partition u like to compress
like this:
# dd if=/dev/zero of=/mounted_fs/dummy bs=4k
It will stop with error "No space left on device" or something similar ... now delete the dummy file and fs is ready for compression.
Warning:
Do it from another root fs (or from live CD), since u can get
in troubles if doing it on running root fs.
excellent that should do it
run "sync" before delete ...
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