In your firm, which high-availability DHCP solutions do you expect you'll choose, and why? What's the secret ingredient? Does this have any drawbacks? Is there a particular reason you chose this over...

In your firm, which high-availability DHCP solutions do you expect you'll choose, and why? What's the secret ingredient? Does this have any drawbacks? Is there a particular reason you chose this over the others? Do you think you'd be able to tell immediately away if your DHCP server was down? How fast would you notice a problem with DHCP in your house?