How do I access a EBS volume that I've created on a EC2 instance?

I have created a EBS volume on /dev/sdh like so:

 $ ec2-attach-volume -d /dev/sdh -i i-7058e010 vol-58f08432
ATTACHMENT  vol-58f08432    i-7058e010  /dev/sdh    attaching   2011-09-19T12:48:01+0000
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Following this tutorial http://aws.amazon.com/articles/1663, I am now trying to "Create an XFS file system on the EBS volume"

But when I try to do that I get:

root@ip-10-100-254-47:~# sudo mkfs.xfs /dev/sdh
/dev/sdh: No such file or directory

When I look at the EBS volume in the console it seems to be working properly:

Attachment:
i-7058e010:/dev/sdh (attached)

EDIT: this instance is not an EBS store instance, does that mean I can't use EBS with it?

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That should actually work, unless your instance i-7058e010 does not correspond to ip-10-100-254-47.

Try partprobe and blkid inside your instance to see whether you can find out more information/force rescanning the bus.

EDIT: this instance is not an EBS store instance, does that mean I can't use EBS with it?

No, whether you are using EBS root or regular S3 manifests ami doesn't have anything to do with the ability to attach EBS volumes.

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PS. if you are trying to do XFS because of xfs_freeze,xfs_unfreeze (consistent snapshotting) be advised that recent kernels support the same controls for ext4 just fine.

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It turned out that /dev/sdh doesn't exist on Ubuntu Natty. I had to use /dev/sdf which maps to /dev/xvdf on the actual server.