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I created an EBS volume and attached it to a CentOS instance on /dev/sdf.
From within the instance, I see it appear as /dev/sdj.

Any explanations for this?

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up vote 2 down vote accepted

The kernel will map the device you specify depending on the drivers installed in order to avoid namespace clashes. For example most of the Ubuntu kernels I have used map /dev/sdf to /dev/xvdf.

According to this post what you are seeing is likely an artifact from a RHEL6.1 kernel change, where they intentionally remap xen drives as X+4.

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Alright then, not a bug, but a feature. – Laizer Jul 18 '13 at 17:39

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