"Using the same system from my previous post, I decided to
compare the creation of new operating system (OS) images from a
downloaded ISO image, a bootable CD image burned from the
downloaded ISO and from a template to see if there's enough
difference to justify the hassle and space used for storing
templates or even ISO images.
"Preparation and Standards
"To start the process, I downloaded the
debian-500-amd64-xfce+lxde-CD-1.iso from a Debian mirror site and
burned it to a CD-R. For each new VM, my timer was set to 0 on my
first click on the XenCenter menu item, VM->New and stopped when
I successfully logged into the new system via the graphical login
screen. The installation choices are all defaults except the
virtual disk size which I changed from 5.0GB to 4.0GB and
recommended memory from 256MB to 512MB. I chose the XFCE graphical
interface for the master and all other images. The installed
operating system footprint is 1.4GB.
"Bootable CD Installation
"This original installation (Master Image) from the bootable CD
fulfilled my expectation that it would be the slowest of all the
tests at 20 minutes. Part of the process that's slow in this
installation is answering all of the individual questions about
keyboard type, language, disk layout, root password, creating a
regular user account, installation type, and GRUB installation.
It's easy to see that this part of the process is worth a few
valuable minutes on its own."