Date: Thu, 27 Sep 2007 12:31:10 +0200 From: Erik Cederstrand <erik@cederstrand.dk> To: freebsd-questions@freebsd.org Subject: gzip compression problems Message-ID: <46FB866E.5040900@cederstrand.dk>
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Hi!
I'm trying to create a custom disk image for installing on a server. The
plan is to PXE boot the server and dd the image to the hard-disk of the
server.
The gzipped files I need for the server are 45MB. However, when I create
a 4GB image, stick the same files in there and gzip the image, the
resulting file is 251MB.
Most of the image is just empty space, so I was expecting the gzipped
image to be roughly 45MB. What's going on?
I used the following commands to create the image:
# dd if=/dev/zero of=/path/to/diskimg bs=1k count=4m
# mdconfig -a -t vnode -f /path/to/diskimg -u 4
# fdisk -BI -b /boot/mbr md4
# bsdlabel -B -b /boot/boot -R md4s1 /path/to/disklayout
# newfs /dev/md4s1a
# mount /dev/md4s1a /mnt/
# make installworld DESTDIR=/mnt
# make distribution DESTDIR=/mnt
# make installkernel DESTDIR=/mnt
# umount /mnt
# fsck -t ufs /dev/md4s1a
# mdconfig -d -u 4
The contents of /path/to/disklayout:
# /dev/md4s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 3G 16 4.2BSD 2048 16384 8
b: 500M * swap
c: * * unused 0 0
Thanks,
Erik
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