What storage controller you have on the failed system? If you have a supported RAID controller then you can put the drives to another server with similar controller and get the virtual disk imported. Once drive are inserted on new controller, drives will be detected as foreign drives. You can import foreign configuration to get the virtual disk visible on new server 
i have 2 hardisk  with raid 1 mirroring  if the raid controller fails i can how can i access data ? whether i can put he harddisk into another computer and access it or any other method to access data  
i have 2 disk with raid 1 mirroring failover