I added one new disk to my Centos5 machine and I want to dedicate this disk to one of my virtual machines (also Centos5). After I added the (empty) disk the machine starts up fine and identified the disk as /dev/sdd It makes we wander what might happen to the host during a future (re)boot. The new disk will get a partition table and logical volumes, all which should be private to the client. The (KVM) host however will also see this disk during boot. My host volume group has a non standard name to prevent collision with the volume group name of the client (VolGroup00 for instance). I know I can even ignore the client group all together on the host. Now I am afraid that during boot time the host sees /dev/sdd as the first disk and tries to boot from it (bios update/reset for instance). Is this a real risk? My question is thus, how can I prevent that this (physical) client disk can be used for booting by the host without messing with the bios/cables? Should I first partition the disk and give one partition to the client (the disk than has a second disk layout stored on this partition). A similar thing can be done with a logical volume, but is this wise? Theo