Data writing method and apparatus

Abstract

The invention provides a data writing method and apparatus, which is applied to a solid state disk (SSD). The method comprises the steps of obtaining a target to-be-erased block in the SSD and target to-be-erased block information, calculating a writing request frequency of a current writing request relative to the target to-be-erased block, and judging whether the writing request frequency meets a preset erasure rule or not, and when the rule is met, determining an obtained next to-be-erased block in the SSD as the target to-be-erased block; and when the rule is not met, storing data information in fragment pages meeting a data writing demand of the current writing request in the SSD and to-be-written data in the current writing request to to-be-written blocks in the SSD, and marking the fragment pages as invalid pages. Through the method, the quantity of valid pages in the to-be-erased blocks is reduced, so that GC delay caused by write amplification is shortened and the influence of data recovery operation on SSD performance is further reduced.

Description

technical field [0001] The present application relates to the field of storage technology, and more specifically, to a data writing method and device. Background technique [0002] A solid-state drive (SSD) is a hard drive composed of a control unit and a solid-state storage unit (NAND Flash). Solid-state hard drives use solid-state storage units to store data. Before data is written, the solid-state storage unit needs to be erased. The basic unit of the erase operation is a block, and each block contains several pages. The basic unit of write operations. [0003] Taking the data corresponding to the write operation stored in the SSD before and after the write operation as an example, there are two steps to complete a write operation: first write the data to the page that has been erased (that is, a blank page), and then write the data to the original page A Page is marked as invalid, and the Page marked as invalid cannot be written again before being erased, and such a Pa...

AI Technical Summary

Problems solved by technology

This feature of erasing first and then writing leads to the problem of GC delay (Garbage Collection Latency). Compared with the write operation, the recycling operation itself brings additional background data movement, which is commonly referred to as write amplification. The GC delay caused by the amplification directly affects the performance of the SSD (the smaller the GC delay, the better the performance of the entire SSD)

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