Why can't I attach new AWS volume to existing AWS instance? [closed]

Question

I'm trying to expand the storage on an AWS EBS volume for which I'm following this "Expanding the Storage Space of an EBS Volume on Linux" guide.

I created a snapshot of my volume and created a new volume out of that. And I'm now trying to attach my newly created volume to my existing instance.

The instance I want to attach it to looks like this:

but when I type Mongo or i-b8ed in the instance field of the attach volume wizard I get no results:

I'm sure I'm in the same Availability Zone (Frankfurt) so I really don't know why it can't find the Instance.

Does anybody know what I'm doing wrong here?

Answer 1

According to your screenshot your instance belongs to

eu-central-1b

and your volume is in different zone

eu-central-1a

that's why it's not able to attach the volume to the instance.