PCIE SSD array data reading method and system and PCIE SSD array data read-write method

Abstract

The invention discloses a PCIE SSD array data reading method and system and a PCIE SSD array data read-write method. Data is directly transmitted from an FC module to a shared memory of a PCIE SSD disk controller without passing through the system memory. Therefore, the system memory cannot become the bottleneck restricting the array performance. In addition, as each PCIE SSD disk is provided with a memory, the memory performance of a disk cannot become the bottleneck restricting the array and disk performance so long as the read-write performance of the memory on each disk is twice of the read-write bandwidth of the disk per se.

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 array solutions are designed according to the fact that the performance of mechanical disks is much 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 regardless of Whether it is a commonly used operating system or the software architecture of the array, the data read and written are first placed 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 a 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 ...

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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