06-04-2011
Well, unless you are actually planning on using the xen functions, I would personally use the vanilla kernel.
The other options, I feel would be to use the 500GB drives in RAID 5 (chunk size should depend on the size of the majority of your files and the type of file system.
For the 1TB drives, a RAID 1E might make more sense. The issue is not only about the speed of the drives in optimal state, but how quickly you can recover from a failure before another read failure causes data loss. RAID 1/10/1E call for a simple copy, where RAID 5 and 6 usually call for an xor checksum.
With larger and larger drives, and the long time to get spares, a failure can easily go through more than one drive and cause data loss.
You may also want to consider using something like DRBD to another machine, instead of just amanda if your data is critical. Alternately, unison works well when the environment is mixed.
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