With the addition of a 3T MyCloud to my home network, I decided to move my WD 3T USB drive to the My Cloud with the intent of setting up some physical redundancy for backup.
When the MyBook is attached, it is visible under as a share under the MyCloud. However within a few minutes, the MyCloud becomes completely unresponsive to anything but a ping… There is a lot of audible activity (thrashing) on the MyBook, but appears to be little on the MyBook.
I let this go for a few hours with no response. detaching the MyBook and power cycling the MyCloud returned activity to normal.