Aspects of Path Sharing in I/OUniversity of California, Santa Cruz, Computer Research Laboratory, 1987 - Computer input-output equipment - 36 pages |
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a₁ approach assume asynchronous disk I/O asynchronous I/O b₁ buffer ports buffer transfer bus bandwidth channel and device channel to buffer channel transfer class i actuators classes of requests coefficient of variation computed conditional expected confidence intervals consider control unit corresponding DASD reconnection DASD workload denote different numbers different speeds disks sharing example expected number groups of disks I/O rate I/O service I/O transfer paths iteration loss system missed reconnection delay n₁ number of class number of request numbers of servers overlapped organization overlapped transfer organization Overlapped vs sequential ovlap paths are busy probability of success propose a simple queueing models r₁ Random Number read access relative error relative performance merits request of class request sources resource Rotational Position Sensing RPS miss seek and latency sequential organization server utilization sharing of I/O simulation results solution string paths success probabilities successful reconnection T₁ total I/O U₁ varying number W₁