Early experiences in evaluating the parallel disk model with the ViC implementation
Parallel Computing - Special double issue: parallel I/O
Performance modeling for realistic storage devices
Performance modeling for realistic storage devices
Computer architecture (2nd ed.): a quantitative approach
Computer architecture (2nd ed.): a quantitative approach
An analytic behavior model for disk drives with readahead caches and request reordering
SIGMETRICS '98/PERFORMANCE '98 Proceedings of the 1998 ACM SIGMETRICS joint international conference on Measurement and modeling of computer systems
Round-like behavior in multiple disks on a bus
Proceedings of the sixth workshop on I/O in parallel and distributed systems
I/O system performance debugging using model-driven anomaly characterization
FAST'05 Proceedings of the 4th conference on USENIX Conference on File and Storage Technologies - Volume 4
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For a wide variety of computational tasks, disk I/O continues to be a serious obstacle to high performance. The focus of the present paper is on systems that use multiple disks per SCSI bus. We measured the performance of concurrent random I/Os, and observed bus-related phenomena that impair performance. We describe these phenomena, and present a new I/O performance model that accurately predicts the average bandwidth achieved by a heavy workload of random reads from disks on a SCSI bus. This model, although relatively simple, predicts performance on several platforms to within 12% for I/O sizes in the range 16-128 KB. We describe a technique to improve the I/O bandwidth by 10-20% for random-access workloads that have large I/Os and high concurrency. This technique increases the percentage of disk head positioning time that is overlapped with data transfers, and increases the percentage of transfers that occur at bus bandwidth, rather than at disk-head bandwidth.