When the Dashboard webapp is showing ‘verifying data protection configuration’ you can get a more detailed status from the box if you ssh into and ‘cat /proc/mdstat’ – you’ll see something like this:
Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4]
md1 : active raid1 sda2[0] sdb2[1]
974722192 blocks super 1.0 [2/2] [UU]
[====>…………….] resync = 21.3% (208528384/974722192) finish=340.8min speed=37457K/sec
md0 : active raid1 sda1[0] sdb1[1]
2040128 blocks [2/2] [UU]
unused devices: <none>