md0: active raid 5 sdd[3] sdb[0]
5860270080 blocks super 1.2 level 5, 512k chunck, algorithm 2[3/2] [u_u]

unused devices : <none>

You may attempt to start the system anyway, or stop now and attempt manual recovery operations. To do this automatically in the furure, add "bootdegraded =true" to the kernel boot options.

If you choose to start tthe degraded RIAD, the system amy boot normaly, but performance may be degraded an
further hardware fault could result in permaent data loss.