Multiple choice technology mainframe

Which of the following describes relative access speed for z9 major storage types?

  1. Tape is faster than DASD

  2. DASD is faster than cache

  3. Real memory is faster than DASD

  4. Optical storage is faster than cache
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The IBM z9 storage hierarchy ranks by access speed: CPU registers/cache are fastest, followed by real memory, then DASD (Direct Access Storage Device - disk), with tape and optical being slowest. Real memory operates at nanosecond speeds while DASD operates at millisecond speeds, making real memory significantly faster than DASD.

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