Finder cannot find drobo

After transferred 1TB files, my mac is slow, so I reboot it.
When the mac restart, Drobo cannot detect in the finder.
But Drobo Dasboard detected there’s drobo 5D in the computer

And there’s four green light and one red light

Anyone can help??

Likely a file system corruption. Check if Disk Utility detects the Drobo volume. If yes, do a repair. Or use Disk Warrior (assuming you are on a Mac)