Why KVM/RHEV guests fail to recognize new virtio disks after hotplugging?

Solution Verified - Updated -

Issue

  • KVM guest fails to detect the new virtio disk after it was successfully hotplugged from virt-manager or via virsh-attach.
  • How can I make the KVM guest detect a disk without rebooting it?
  • We cannot hot-add a LUN disk to a VM in RHEV
  • Hot plugged Virtual Machine disk doesn´t show up in guest

Environment

  • Red Hat Enterprise Linux 5
  • KVM
  • RHEV

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