A number of factors can cause your Drobo storage device to go into data protection mode:
The data protection process can take a while, from a few minutes to several hours or longer, depending on the amount of data. The time depends upon the amount of data on the Drobo device, the size of the files, the speed of the host, etc. If your Drobo device encounters bad blocks on the hard drives, etc., that will extend the time it takes for data protection as well.
During the data protection process:
Once the drive lights stay solid green, the data protection process is complete. During the data protection process, Drobo Dashboard will give you an estimated time for data protection to complete ( it is not abnormal for the Drobo to lose connection with the Dashboard ).
Note: During the data protection process, you will see a message indicating Drobo cannot currently protect your data against hard drive failure: