Implementation and evaluation of a multimedia file system

Niranjan, T.; Chiueh, Tzi‐cker; Schloss, G.A.

doi:10.1109/mmcs.1997.609602

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…HERMES uses a variable-size block referred to as ''extent''. Tiger Shark [12] and MMFS [19] also use variable block size. In a certain circumstance, single hard disk drive supports soft real time I/O as well as legacy best-effort I/O request.…”

Section: Related Workmentioning

confidence: 99%

Relieving the burden of track switch in modern hard disk drives

Gim

Won

2010

Multimedia Systems

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In this work, we propose a novel hard disk technique, ''AV Disk'', for modern multimedia applications. Modern hard disk drives adopt complex sector layout mechanisms to reduce track and head switch overhead. While these complex sector layout mechanism can reduce average overhead involved in the track and head switch, they bring larger variability in the overhead. From a multimedia application's point of view, it is important to minimize the worst case I/O latency rather than to improve the average IO latency. We focus our effort to minimize track switch overhead as well as the variability in track switch overhead involved in disk I/O. We propose that track of the hard disk drive is aligned with a certain IO size. In this work, we develop an elaborate performance model with which we can compute the optimal IO unit size for multimedia applications. We propose that hard disk controller is responsible for positioning data blocks in the hard disk platter in such a manner that I/O units are not placed across the track boundaries, where a single I/O unit has size of 32-128 KByte. Optimal IO unit size is used in aligning the tracks in hard disk drives. We develop Skewed Sector Sparing technique in aligning a track with a given IO size. However, when the I/O unit for alignment is increased to 128 KByte, 17% of the disk space becomes unusable. Despite the decreased storage area, track aligning technique increases the overall performance of the hard disk. According to our simulation-based experiment, overall disk performance increases about 5-25%. Given that capacity of hard disk increases 100% every year, we cautiously regard it as reasonable tradeoff to increase the I/O latency of the disk.

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Section: Related Workmentioning

confidence: 99%

Relieving the burden of track switch in modern hard disk drives

Gim

Won

2010

Multimedia Systems

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“…Similarly, MMFS is a single disk file system that adds continuous media support to a FreeBSD-based file system [29]. The Tiger Shark file system from IBM and XFS from SGI are results of commercial efforts to build integrated file systems [17,18].…”

Section: Related Workmentioning

confidence: 99%

Design considerations for the symphony integrated multimedia file system

et al. 2003

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“…Such a system typically stores a large number of videos in one or more servers [7][8][9][10][11][12][13][14]. When a request for a video arrives, it is loaded from disks in a server and transmitted to the client in an isochronous stream [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

An adaptive video multicast scheme for varying workloads

Hua

Oh²,

2002

Multimedia Systems

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Periodic broadcast and scheduled multicast have been shown to be very effective in reducing the demand on server bandwidth. While periodic broadcast is better for popular videos, scheduled multicast is more suitable for less popular ones. Work has also been done to show that a hybrid of these techniques offer the best performance. Existing hybrid schemes, however, assume that the characteristic of the workload does not change with time. This assumption is not true for many applications, such as movie on demand, digital video libraries, or electronic commerce. In this paper, we show that existing scheduled multicast techniques are not suited for hybrid designs. To address this issue, we propose a new approach and use it to design an adaptive hybrid strategy. Our technique adjusts itself to cope with a changing workload. We provide simulation results to demonstrate that the proposed technique is significantly better than the best static approach in terms of service latency, throughput, defection rate, and unfairness.

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Implementation and evaluation of a multimedia file system

Cited by 18 publications

References 7 publications

Relieving the burden of track switch in modern hard disk drives

Relieving the burden of track switch in modern hard disk drives

Design considerations for the symphony integrated multimedia file system

An adaptive video multicast scheme for varying workloads

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