On Sat, Jul 07, 2007 at 10:28:01PM -0700, Michael Eubanks wrote: > Hello all, > > I am updating a system that has been around for some > time now. I would like to make a compressed disk > image after the final setup is complete, although, I'm > guessing that the unused blocks will not allow me to > compress the image as well as I could with a > previously clean disk (considering the disk has been > in use for some time now). Is there a way to do this > - zero out unused blocks to optimize compression? I > generally do this with Windows machines using the > cipher command (killing cipher after it has finished > writing zeroes). After running cipher I use dd to > create a compressed HDD image for later use. I'd like > to be able to do the same with FreeBSD.
What about: # dd < /dev/zero > BIG_EMPTY_FILE bs=128k # rm BIG_EMPTY_FILE Comes close to what you want, only a couple of indirect blocks are not zeroed this way but the majority of unused blocks will be. > -Michael S. Eubanks > [EMAIL PROTECTED] -- Paul Schenkeveld _______________________________________________ freebsd-chat@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-chat To unsubscribe, send any mail to "[EMAIL PROTECTED]"
