Average Access Time (Tacc)

Average Access Time (Tacc)

• Reload (Tape->Disk) impacts user response time directly.
• Tacc = Hit Time + Miss Rate x Miss Penalty
  • Hit access = access to data resident in Disk layer
  • Access miss = access to data not resident in Disks
    • Hit time: Disk Access Time
    • Miss Penalty: Tape Library Access Time
    • Miss Rate: Access miss probability

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