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Data storage device and method for managing buffer memory

A technology of data storage device and buffer memory, which is applied in data buffer arrangement, memory system, electrical digital data processing and other directions, can solve problems such as performance deterioration, and achieve the effect of avoiding performance deterioration

Inactive Publication Date: 2004-06-09
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the performance of an external storage device using a dual ring buffer system in the sector buffer is degraded compared to an external storage device using a single ring buffer system when there is an access biased towards data write or read

Method used

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  • Data storage device and method for managing buffer memory
  • Data storage device and method for managing buffer memory
  • Data storage device and method for managing buffer memory

Examples

Experimental program
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Embodiment Construction

[0030] Hereinafter, the present invention will be described in detail according to the embodiments shown in the drawings. In the current embodiment, a hard disk drive using a magnetic disk as a recording medium as an external storage device will be explained by way of example.

[0031] FIG. 1 is a block diagram showing the structure of the main part of the hard disk drive 100. As shown in FIG.

[0032] The hard disk drive 100 is an external storage device in which each magnetic head 103 seeks on a magnetic disk 101 rotatably driven by a spindle motor 102, and when staying on a predetermined track (at a predetermined position), on the magnetic disk 101 Write data, or read data written on the magnetic disk 101. The magnetic disk 101 is a recording medium for recording data as magnetic information, and is mounted in a single or multiple form as required. However, Figure 1 shows a single example.

[0033]When the hard disk drive 100 is in an operating state, the magnetic disk 101 is c...

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Abstract

To avoid degradation of performance of a storage apparatus even when access biased to writing or reading of data is performed in a buffer memory that adopts a dual ring buffer system as a data structure. A sector buffer for caching an access request is provided in a DRAM of the storage apparatus. The sector buffer has a first ring buffer (BUF_W) that temporarily holds an external write request for a recording medium in advance of its process to the recording medium, and a second ring buffer (BUF_R) that retains data read from the recording medium according to an external read request for the recording medium. An MPU of the storage apparatus shifts a BPAGE of the BUF_R or BUF_W according to external access patterns to the recording medium to thereby change the buffer sizes of the BUF_R and BUF_W.

Description

Technical field [0001] The present invention relates to a data storage device, in particular to the control of a buffer memory. When data is written to or read from a recording medium such as a magnetic disk, the buffer memory is used to temporarily store the data therein . Background technique [0002] In an external storage device of a computer including a magnetic disk device (hard disk drive), a buffer memory (DRAM: Dynamic Random Access Memory) called a sector buffer is prepared as a means for improving the performance of data reading and writing processing. Device. It is always convenient to cache (save) data write requests (including write data) or read-only data from the host system. [0003] A data structure called a ring buffer is usually used as a sector buffer. The ring buffer is a technology used to connect the beginning and the end of the buffer so that a buffer with a finite length can be treated as a buffer with an infinite length (for example, see Patent Document...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06G06F12/00G06F12/02G11B20/10
CPCG11B20/10527G11B2020/10666G11B2020/1062
Inventor 山田秀二齐藤博史斋藤高裕福久良司
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV