Unable to boot the RHEL 5.9 virtual machine after migrating from HyperV 2008 to HyperV 2012

Issue

• After migrating the RHEL 5.9 virtual machine from HyperV 2008 to HyperV 2012, vm is unable to boot, and following errors are observed on console at the time of booting:

  Unable to access resume device (LABEL=SWAP-hda2)
  mount: could not find filesystem '/dev/root'
  setuproot: moving /dev failed: no such file or directory
  setuproot: error mounting /proc: no such file or directory
  setuproot: error mounting /sys: no such file or directory
  switchroot: mount failed: no such file or directory
  kernel panic - no syncing: attempted to kill init!