Troubleshooting long restores

Hi, I have a restore that is taking extremely long.  Enabling the trace flags, I find a lot of such entries stretching for about 19 hours and still running.  What is actually hapenning here?  Thanks

07/14/2016 10:09:26,spid58,Unknown,Completed MSDA in stream 5<c/> thread 2152
07/14/2016 10:09:25,spid58,Unknown,Starting MSDA in stream 5<c/> thread 2152<c/> length 0x100000
07/14/2016 10:09:25,spid58,Unknown,Completed MSDA in stream 5<c/> thread 2152
07/14/2016 10:09:25,spid58,Unknown,Completed MSDA in stream 4<c/> thread 5196
07/14/2016 10:09:25,spid58,Unknown,Starting MSDA in stream 4<c/> thread 5196<c/> length 0x100000
07/14/2016 10:09:25,spid58,Unknown,Completed MSDA in stream 4<c/> thread 5196
07/14/2016 10:09:25,spid58,Unknown,Completed MSDA in stream 1<c/> thread 3936
..........
07/13/2016 15:59:09,spid58,Unknown,Completed MSDA in stream 2<c/> thread 5056
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 5<c/> thread 2152<c/> length 0x40000000
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 4<c/> thread 5196<c/> length 0x40000000
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 3<c/> thread 1524<c/> length 0x40000000
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 2<c/> thread 5056<c/> length 0x40000000
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 1<c/> thread 3936<c/> length 0x40000000
07/13/2016 15:43:42,spid58,Unknown,Starting MSDA in stream 0<c/> thread 5632<c/> length 0x40000000

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Yeoh Ray Mond, Associate, Yohz Software