Data reading method and system and data read/write method for PCIE (Peripheral Component Interconnect Express) SSD (Solid State Drive) array

Abstract

The present invention discloses a data reading method and system and a data read / write method for a PCIE (Peripheral Component Interconnect Express) SSD (Solid State Drive) array. Buffer and cache of IO data is not located in an array system memory, but located in a shared memory of an FC module. According to the data reading method and system and the data read / write method for the PCIE SSD provided by the present invention, it is avoided that system memory performance becomes a bottleneck that constraints array performance; and additionally, because each PCIE SSD disk has a self memory, memory performance on the disk can be ensured not to be the bottle that constraints array and disk performances with the only need for ensuring that memory read / write performance in each disk can reach twice of a read / write bandwidth of the disk.

Description

technical field [0001] The invention relates to a data reading method, system and reading and writing method of a PCIESSD array. Background technique [0002] The existing operating systems and disk arrays are designed according to the fact that the performance of mechanical disks is far lower than that of memory. Compared with the read and write delays of mechanical disks, the read and write delays of memory are almost negligible, so whether it is The commonly used operating system is still the software architecture of the array. The data read and written are first stored in the system memory, and then sent to the disk or returned to the application. When reading, it will first check whether the data is hit in the memory cache. If it can be hit, it will be taken out of the memory cache and returned to the application. If it cannot be hit, it will be taken out from the disk and sent to the memory for the application. Let's take a look at the read and write process of the cu...

AI Technical Summary

Problems solved by technology

For example, the theoretical write bandwidth of an array composed of 48 Intel p3700 solid-state drives can reach 96GB / s, and the read bandwidth is even higher. In this case, the current memory performance has become the bottleneck of the array performance.

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