Disk controllable buffer write method, controller, mixed io scheduling method and scheduler

Abstract

The invention discloses a disk controllable buffer write method, a controller, a hybrid IO scheduling method and a scheduler, which belong to the technical field of computer storage and include: predicting the write delay state of the next write request according to the write delay characteristics of the disk, if the disk If the request queue is empty and the prediction result is high, the disk status is set to be unavailable, and the filling data is written until the next prediction result is not high. At this time, the ADW is reset to 0, and the status is reset to available; if If the disk request queue is empty and the prediction result is medium, keep the disk available and write the filling data; when the heterogeneous storage node receives a write IO request, if l(t)>L, and the next write request in the disk If the write latency status is low or medium, or l(t)≤L, and the write latency status of the next write request in the disk is low, the request is redirected to the disk. The invention can improve the overall performance of the disk, and can improve the service life of the high-speed hard disk and the utilization rate of the disk in heterogeneous storage nodes.

Description

technical field [0001] The invention belongs to the technical field of computer storage, and more specifically relates to a disk controllable buffer writing method, a controller, a hybrid IO scheduling method and a scheduler. Background technique [0002] In order to improve the write performance of the disk, a write buffer is often used. The internal write buffer of the disk is specifically a buffer in the disk for temporarily storing the data to be written contained in the write request sent to the disk. Compared to the host, once the requested data is written to the internal buffer of the disk controller, the request has been completed, and the write latency at this time is low. However, when the internal buffer of the disk is full, the disk controller must block external requests until the data in the internal buffer is flushed to the disk, and the write latency at this time is high. That is to say, due to the existence of the write buffer, during the use of the disk, a...

AI Technical Summary

Problems solved by technology

However, heterogeneous storage nodes also have some disadvantages

Taking a heterogeneous storage node composed of disks and solid-state disks as an example, the traditional writing scheme is to first write the requested data to the solid-state disk, and then migrate the data from the solid-state disk to the disk, resulting in excessive wear of the solid-state disk and low disk utilization.

This unbalanced utilization between disks and SSDs not only causes rapid wear of the latter, but also results in extremely high tail latencies due to frequent garbage collections due to intensive write operations to the latter

[0004] In general, the overall write performance of disks still needs to be improved; for heterogeneous storage nodes containing disks, their overall performance and the service life of the high-speed hard disks they contain need to be improved

Images