My colleagues have written a comprehensive step-by-step guide to enabling disk encryption in your choice of RHEL 5.2 or SLES 10 SP2. This is pretty much as easy as it gets. If you have questions or comments about the paper, they also have an online forum for security discussions. I suggest the PDF version which packages the whole (short) paper up into a single, easily consumable whole.
This document is just the first of the new series of “Linux blueprints” (step-by-step guides for accomplishing specific tasks with Linux) which will be published on the IBM Systems Information Center (Info Center).