I have a default amazon ec2 instance with 8GB root volume size. I am running out of space. I have:

1. Detach the current EBS volume in AWS Management Console (Web).
2. Create snapshot of this volume.
3. Created a new Volume with 50G space with my snapshot.
4. Attach the new volume back to the instance to /dev/sda1

However, when I reconnect to the account with:

> df -h

I can see from the management console that my new

Filesystem     1K-blocks      Used   Available  Use%  Mounted on
/dev/xvda1       8256952   8173624        0     100%  /
tmpfs            308508        40    308468     1%    /dev/shm

It's still not using my new volume's size, how to make this work?