[RHEL6.0] KVM: can't determine target name for virsh detach-disk when repeating attach and detach

Solution Verified - Updated -

Issue

  • If a disk is online  attached/detached to a RHEL6.0 guest OS repeatedlyusing a same target  name (e.g. vda), the target device name recognized by the guest OS is  incremented (e.g. vda => vdb => vdc => ...).
  • As a  result, admins can't easily determine a target name to detach from the  guest OS, since there is no target name mapping rule between host and  guest.
  • How reproducible: Always

Environment

  • Red Hat Enterprise Linux 6.0
    • kernel-2.6.32-71.el6
    • qemu-kvm-0.12.1.2-2.113.el6
    • libvirt-0.8.1-27.el6
    • libvirt-client-0.8.1-27.el6

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