More and more frequently there is business critical installations where speed of deployment is essential not only in startup phase, but also in the subsequent recovery of a failed server.
If you do not choose Boot from SAN!
Or to make reinstallations migrations from the "iron" for not bringing previous configurations or in the case (as in blade servers from IBM) is necessary to revise the layout of the disks during upgrades.
Booting from the network means you always have the media to make on an installation on a test environment
