16.04 Raid 5 Degraded Raid

dom134@server:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 1.8T 0 disk
└─sda1 8:1 0 1.8T 0 part /media/usb
sdb 8:16 0 465.8G 0 disk
├─sdb1 8:17 0 5.6G 0 part
│ └─md0 9:0 0 16.8G 0 raid5
└─sdb2 8:18 0 460.2G 0 part
└─md1 9:1 0 1.4T 0 raid5 /
sdc 8:32 0 465.8G 0 disk
├─sdc1 8:33 0 5.6G 0 part
│ └─md0 9:0 0 16.8G 0 raid5
└─sdc2 8:34 0 460.2G 0 part
└─md1 9:1 0 1.4T 0 raid5 /
sdd 8:48 0 465.8G 0 disk
├─sdd1 8:49 0 5.6G 0 part
│ └─md0 9:0 0 16.8G 0 raid5
└─sdd2 8:50 0 460.2G 0 part
└─md1 9:1 0 1.4T 0 raid5 /
sde 8:64 0 465.8G 0 disk
├─sde1 8:65 0 5.6G 0 part
│ └─md0 9:0 0 16.8G 0 raid5
└─sde2 8:66 0 460.2G 0 part
└─md1 9:1 0 1.4T 0 raid5 /