I try to add a fresh, unformatted disk partition to a KVM guest. I follow the directions given here: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Virtualization/index.html#proc-Virtualization-Adding_storage_devices_to_guests-Adding_physical_block_devices_to_virtualized_guests First I check that the module acpiphp is present on the guest. It is. On the host I write: virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable - test1 is my guest domain - /dev/sdb1 is the name of the unformatted partition on the host - sda is what it is supposed to be called on the guest (the name is unused on the guest) - the example in RHEL Virtualization guide says "--mode readonly". This does not sound right for a hard disk; hence I try "--mode shareable"; the error (see below) however is the same, whichever I use Now, the command above produces this error. I find no google results with this error text. Can someone tell, what causes the error? > error: Failed to attach disk error: operation failed: adding scsi > disk controller failed: type scsi not a hotpluggable PCI device. > failed to add if=scsi - Jussi -- Jussi Hirvi * Green Spot Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi at greenspot.fi * http://www.greenspot.fi