Error of "No more available PCI addresses" when adding VirtIO disk and VirtIO-SCSI disk is failing to activate successfully.

Solution Verified - Updated -

Issue

  • Unable to add disk to guest.
  • When adding VirtIO disk error is "No more available PCI addresses".
  • Able to add VirtIO-SCSI disk but it is not activating.

Environment

  • Red Hat Enterprise Linux 3.5

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