DiskXtender & Tivoli SANergy

I suspect this might be a long shot but has anyone managed to get DiskXtender working in an MSCS cluster with Tivoli SANergy installed ? SANergy does something odd to the volumes that prevents them being seen properly by the OS. So, for example a SANergy volume will show as normal drive in Windows explorer, but SRVFINO -ns shows no disks - this is normal behaviour for SANergy. DiskXtender installs OK, but when I try and create an extended volume it fails with "ERROR_FILE_NOT_FOUND" even though the drive I want to eXtend shows in the list of available drives. I know Tivoli SANergy is not a widely used product, but I thought I'd ask..................