Evolution of Mass Storage Systems : Issues and Challenges
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概要
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Satellite remote sensing, medical imaging, and digital multimedia have all seen rapid growth in the last decade. The ubiquity of the World Wide Web has fueled the common citizen's thirst for information. In the US, web access is reasonably priced and this has increased the demand for high resolution images with attendant need for more storage. What was considered mass storage a decade ago is what is available on the desktop in any home today. Large data gathering organizations, like space and weather agencies, have seen their demand for storage, and the data rate, begin to skyrocket. On the hardware side, this has led to the development of technologies like RAID and RAIT. Despite areal densities of disk drives doubling about every 18 months from the mid-90s, the need for room for the storage devices has led to new serial connections, and to networked storage. Connectivity options now abound: Fibre Channel, IEEE 1394, the various generations of SCSI, USB and soon, Infiniband. Third party transfers have been talked about since the early 70's, but Network-attached storage (NAS) and, more recently, Storage Area Networks (SAN) have emerged to alleviate bottlenecks in I/O and to simplify addition of devices. Areal density growth curves indicate that hard disk drives have now topped an annual compound growth rate (ACGR) of 100% and could become cheaper than magnetic tapes if the tape industry itself does not significantly improve its development roadmap. The sheer growth in digital storage has introduced asset management systems to handle the complexity of managing data which may move between disk and tape, or reside on tape, but should be transparently available on disk.
- 社団法人日本磁気学会の論文
- 2001-05-01