Scanner and method
A scanning device and a technology for scanning data, applied in the directions of error detection of redundant codes, generation of response errors, etc., can solve the problems of irrecoverable data, accumulative increase in the number of errors, user losses, etc., to reduce adverse effects, reliable Effects of data error handling methods
Active Publication Date: 2010-12-01
CHENGDU HUAWEI TECH
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Problems solved by technology
[0004] The inventor found in the research that after the data is sent to the data processing system, the problem of accumulating the number of errors may occur after the end of the entire read operation: because the data stored in the Nand Flash is the data that occurred before the correction, and the read, write and Data storage may cause data errors again. Therefore, when the disks in the storage array unit are used later, the number of errors will increase cumulatively, which may cause the number of errors to exceed the ECC correctable range, and the data cannot be recovered, causing losses to users.
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[0020] The invention will now be more clearly described with reference to the accompanying drawings, in which embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
[0021] Such as figure 1 As shown, it is a schematic flowchart of a scanning method disclosed in an embodiment of the present invention. The scanning method consists of steps:
[0022] Step S1, receiving a request from the data processing system to scan data, and starting to scan the storage device;
[0023] Step S2, determining the number of errors occurring during scanning, and determining the scanning level corresponding to the number of errors according to the number of errors;
[0024] It should be noted that, in step S2, the determination of the scan level corresponding to the error number according to the error number is based on the number of bits of the error number that occurs i...
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The embodiment of the invention discloses a scanner and a method. The method comprises the following steps: receiving a scanning data request of a data processing system; starting the scanning of a storage device; determining error numbers appearing in the scanning; determining the scanning grades corresponding to the error numbers according to the error numbers; and outputting a scanning result of the different error numbers according to the scanning grades corresponding to the error numbers. The embodiment of the invention also provides the scanner, and can reduce the accumulation of the error number in a storage array unit and improve the reliability of the data storage.
Description
technical field [0001] The present invention relates to a storage device, and more specifically, to a scanning device and method. Background technique [0002] Solid State Disk (SSD) is a hard disk composed of a control unit and a solid-state storage array unit, such as Nand Flash. Solid State Disk has no mechanical structure of ordinary hard disk, and has low power consumption, no noise, and anti-vibration , low heat, fast transmission speed and other advantages. [0003] The basic unit of Flash write operation is a page. For example, Nand Flash includes 2KB / 4KB / 8KB, etc. The manufacturing process of NAND Flash determines that random bit flip events may occur in operations such as data reading and writing to NAND Flash. For this kind of event, the ECC (Error Checking&Correction) designed outside the Flash chip can provide effective protection for data. Before the data is written into the Nand Flash, the ECC check value is first obtained through the encoding operation, and...
Claims
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Inventor 杨继涛柯乔李欣张琴
Owner CHENGDU HUAWEI TECH