Staller, Allan pisze:
Any Crypto Assist processors present? Makes a big difference!
IMHO it depends.
1. BIG difference is for CPACF, which is present in every mainframe
since z/990 and usually enabled. Crypto cards are much slower and do not
increase the process (CPACF enabled is pre-req for crypto cards).
2. The software must be willing to use ICSF services or CPACF directly,
otherwise no crypto HW would change anything. IBM EF does.
3. For some encrypting products including CA ones zIIP is your friend.
Such workload can run on zIIP. While it won't change total CPU cycles,
it could make huge difference in software bills.
BTW: I would SERIOUSLY re-think if I really need encrypted tapes. If the
answer is still YES, then I would use H/W encryption built-in tape
drives. My $0.02
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Radoslaw Skorupka
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