How to scale MongoDB
I know that MongoDB can scale vertically. What about if I running out of disk?

I am currently using EC2 with EBS. As you know, I have to assign EBS for a fixed size.

What if the mongodb growth bigger than the EBS size? Do I have to create a larger EBS and Copy & Paste the files?

Or shall we start more MongoDB instance and each connect to different EBS disk? In such case, I could connect to a different instance for different databases. 
How to scale MongoDB
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I know that MongoDB can scale vertically. What about if I running out of disk?

I am currently using EC2 with EBS. As you know, I have to assign EBS for a fixed size.

What if the mongodb growth bigger than the EBS size? Do I have to create a larger EBS and Copy & Paste the files?

Or shall we start more MongoDB instance and each connect to different EBS disk? In such case, I could connect to a different instance for different databases. 