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Exactly. 8xx and newer hardware has sufficient CPU capacity to do the encryption even without the crypto card add-on. On the newer machines the bottleneck is moving away from how fast we can feed the tape drives (CPU/RAM/bus/DASD subsystem) to the actual tape drives and their interfaces. And if you're on an older box, fine. IBM could acknowledge the performance penalty that encryption carries. Some shops are probably willing to live with the performance as long as the data is safe(r).
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