Context. Real-time systemsRaw disk I/OHard disks with built-in scheduler/queueMixed WorkloadDisk requests with deadline/response time requirementsBackground/best effort requestsWant to guarantee real-time deadlines. Difficulties. Real-time schedulability analysis generally relies on knowing worst-case execution times (WCET)?Non-preemption makes guarantees even more difficultVariability of disk service times is extreme (tens of milliseconds to several seconds)?Result is that hard disks a30011
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