Analysis of Retrieval of Multimedia Data Stored on Magnetic Tape
نویسندگان
چکیده
This paper discusses scheduling of random I/O requests for multimedia data stored on magnetic tape using serpentine data layout. Results from simulations and real experiments show that substantial improvements of retrieval performance can be achieved by proper I/O scheduling. A new algorithm, Multi-Pass Scan Star (MPScan*), is presented and shown to give better results than any other known algorithm. The level of Quality of Service that can be reached by use of MPScan* is discussed in the context of retrieval of image and short video segment data.
منابع مشابه
Challenges for Tertiary Storage in Multimedia Servers
The low cost per megabyte of optical disk and magnetic tape storage make these technologies particularly attractive for use in large capacity storage servers, including multimedia servers. However, these devices have performance problems that range from high costs for many optical drives to low performance and lack of random access in tape drives. We evaluate the performance on multimedia appli...
متن کاملContent Based Radiographic Images Indexing and Retrieval Using Pattern Orientation Histogram
Introduction: Content Based Image Retrieval (CBIR) is a method of image searching and retrieval in a database. In medical applications, CBIR is a tool used by physicians to compare the previous and current medical images associated with patients pathological conditions. As the volume of pictorial information stored in medical image databases is in progress, efficient image indexing and retri...
متن کاملNonlinear Model of Tape Wound Core Transformers
Recently, tape wound cores due to their excellent magnetic properties, are widely used in different types of transformers. Performance prediction of these transformers needs an accurate model with ability to determine flux distribution within the core and magnetic loss. Spiral structure of tape wound cores affects the flux distribution and always cause complication of analysis. In this paper, a...
متن کاملScheduling Non-Contiguous Tape Retrievals
Large data installations normally archive relatively inactive data to a near-line tape library. The tape library performs reasonably well for sequential-access retrieval workloads. However, if the retrieval access slices across multiple data sets, or makes retrievals from scattered portions of a large data set, then the performance can suffer
متن کاملEnabling search over encrypted multimedia databases
Performing information retrieval tasks while preserving data confidentiality is a desirable capability when a database is stored on a server maintained by a third-party service provider. This paper addresses the problem of enabling content-based retrieval over encrypted multimedia databases. Search indexes, along with multimedia documents, are first encrypted by the content owner and then store...
متن کامل