Is it possible to use persistent reservation with a direct lun in a RHEV guest system?

Issue

• Persistent Reservation “sg_persist” command fails when a disk is exposed to the Guest OS using RHEV-M 3.5.
• In RHEV-M, when creating a guest OS and exposing FC disks to it, by default source device is selected as mapper device like `/dev/mapper/..".
• Even when sg_io parameter is set to ‘Unfiltered’, persistence reservation command is failing.

From Web-admin portal >> External (direct lun) >> Interface: VirtIO-SCSI >> Storage Type: Fibre Channel >> Enable SCSI Pass-Through >> Allow Privileged SCSI I/O

• In the XML of the guest, this is seen as :

<disk type="block" device="lun" sgio="unfiltered" snapshot="no">
  <driver name="qemu" type="raw" cache="none" error_policy="stop" io="native"></driver>
  <source dev="/dev/mapper/3624a9370f112d7a4b4d4270600012669"></source>
  <backingStore></backingStore>
  <target dev="sda" bus="scsi"></target>
  <serial></serial>
  <alias name="scsi0-0-0-0"></alias>
  <address type="drive" controller="0" bus="0" target="0" unit="0"></address>
</disk>