We've been using CentOS 6.4 for both host and KVM guests for our own internal uses here, ftp server, mail servers, web server, etc. I am getting to where we want to offer virtual servers for lease but to do so we need some method of measuring and/or limiting traffic to individual guests. I am wondering what others are using for this purpose? I know that you can look at traffic stats on the bridge on the host machine but that information is lost when the machine is rebooted. I'm wondering if there is any software that databases that information on an ongoing basis and does not lost information across reboots? Second question, what are the advantaged and disadvantages of KVM verses Xen? I played with Xen back when I had CentOS 5, but find KVM easier to work with and not much difference in performance. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.