Data transfer between disks of Windows VM hosted in Red Hat KVM is very slow

Solution Verified - Updated -

Issue

  • RHEL server is hosting Windows VM (KVM)
  • Windows guest has 2 disks (C and D) exported from local disk of host
  • Copying between C and D is slow (4-5MB/s)
  • The IDE driver is used for VM disk

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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