Chapter 3: Disk drive data placement and scheduling
Abstract
Commodity disks with Fixed Block Architecture - FBA (fixed size sectors) have replaced Count Key Data - CKD disks associated with mainframes, but are simulated by the disk array cache in systems running z/OS on IBM mainframes. Zoned bit recording - ZBR, Shingled Magnetic Recording - SMR and Energy Assisted Magnetic Recording - EAMR provide higher storage capacity. Disk scheduling policies and data placement to minimize seek distance and access time. Shortest Access Time First - SATF scheduling is discussed in detail and is extended with a version providing lookahead and two priority classes. Analysis of queueing delays in disks with FCFS (with zoning) and SCAN policy is discussed. We ...
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