Design considerations for the symphony integrated multimedia file system

Shenoy, Prashant; Goyal, Pawan; Rao, S.; Vin, Harrick M.

doi:10.1007/s00530-003-0104-5

Cited by 13 publications

(19 citation statements)

References 49 publications

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“…In a certain circumstance, single hard disk drive supports soft real time I/O as well as legacy best-effort I/O request. Shenoy et al [27] suggest file system for multimedia servers.…”

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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“…In a certain circumstance, single hard disk drive supports soft real time I/O as well as legacy best-effort I/O request. Shenoy et al [27] suggest file system for multimedia servers.…”

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 [31], the authors consider alternative design considerations for integrated multimedia file system that efficiently supports the heterogeneity in application requirements. In particular, they consider the buffer subsystem that enable multiple data type specific caching policies to coexist.…”

Section: Related Workmentioning

confidence: 99%

A unified benchmarking and model-based framework for building QoS-aware streaming media services

2006

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A number of technology and workload trends motivate us to consider the appropriate resource allocation mechanisms and policies for streaming media services in shared cluster environments. We present MediaGuarda model-based infrastructure for building streaming media services -that can efficiently determine the fraction of server resources required to support a particular client request over its expected lifetime. The proposed solution is based on a unified cost function that uses a single value to reflect overall resource requirements such as the CPU, disk, memory, and bandwidth necessary to support a particular media stream based on its bit rate and whether it is likely to be served from memory or disk. We design a novel, time-segment-based memory model of a media server to efficiently determine in linear time whether a request will incur memory or disk access when given the history of previous accesses and the behavior of the server's main memory file buffer cache. Using the MediaGuard framework, we design two media services: (1) an efficient and accurate admission control service for streaming media servers that accounts for the impact of the server's main memory file buffer cache, and (2) a shared streaming media hosting service that can efficiently allocate the predefined shares of server resources to the hosted media services, while providing performance isolation and QoS guarantees among the hosted services. Our evaluation shows that, relative to a pessimistic admission control policy that assumes that all content must be served from disk, Media-L. Cherkasova · W. Tang (B) Guard (as well as services that are built using it) deliver a factor of two improvement in server throughput.

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“…This is done in the Symphony system [29]. In Symphony, they propose a QoSaware scheduler which partitions the time spent in servicing classes within a round based on the fractions associated with the service classes such as periodic, aperiodic real-time requests, and best-effort requests.…”

Section: Related Workmentioning

confidence: 99%

“…Ensuring continuous retrieval of each strand requires that the service time not exceed the minimum of playback durations of the blocks retrieved for each strand during a round, which is a typical greedy admission control strategy [33,29]. The simple admission control decisions are based on the worst case scenario.…”

Section: Related Workmentioning

confidence: 99%

QoS-Aware Admission Control and Dynamic Resource Provisioning Framework in Ubiquitous Multimedia Computing Environments

2005

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A ubiquitous service deployment is emerging in the multimedia, networking, and wireless mobile computing area. Therefore, there has been an increasing demand for ubiquitous computing environments to support a certain degree of quality of service (QoS) to meet various service requirements from different computing and networking applications, and to better utilize the computing resources. However, supporting QoS in the ubiquitous computing environments has also raised great concerns regarding the applicability of any QoS solution. Management of such ubiquitous multimedia applications requires new mechanisms, i.e., Soft-QoS framework, to be developed for admission control, negotiation, allocation, and scheduling. In this paper, we present a novel negotiated admission control algorithm that exploits the degradability property of applications to improve the performance of the system. The algorithm is based on setting aside a portion of the resources as reserves and managing it intelligently, so that the total utility of the system can be maximized. The mixed greedy and predictive strategy leads to an efficient protocol that also improves the system performance. We use the constructs of application benefit functions and resource demand functions in the integrated admission control and negotiation protocol. We applied our Soft-QoS framework to the admission controlling and resource scheduling for ubiquitous multimedia devices such as Continuous Media (CM) or Video-On-Demand (VOD) servers, where multimedia applications can generally tolerate certain variations on QoS parameters by providing multiple classes with consistently proportional rather than absolute QoS. Extensive simulation experiments are presented in the paper to evaluate the performance of the novel mechanisms and compare it against some other methods used in the past.

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Design considerations for the symphony integrated multimedia file system

Abstract: Abstract

Cited by 13 publications

References 49 publications

Relieving the burden of track switch in modern hard disk drives

Relieving the burden of track switch in modern hard disk drives

A unified benchmarking and model-based framework for building QoS-aware streaming media services

QoS-Aware Admission Control and Dynamic Resource Provisioning Framework in Ubiquitous Multimedia Computing Environments

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