A Cleaning Method for Persistent Cache in Host-Aware Tile Recording Disk

Abstract

The invention discloses a method for cleaning a persistent cache in a host perceptual tile recording disk, which comprises the following steps: (1) monitoring the use condition of the tile recording disk, and if an idle window is detected and the residual space of the persistent caches is lower than a preset idle threshold value, turning to a step (2); (2) obtaining use information of the magnetictrack area, and determining a target magnetic track area needing to write data when the persistent cache is cleaned; And (3) constructing a sequential write request according to the use information of the target track area, and writing the sequential write request into the target track area to trigger the operation of cleaning the persistent cache of the tile recording disk. The data in the persistent cache can be actively cleaned by utilizing the idle time of the system, so that the performance of the tile recording disk sensed by the host is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of data storage, and more particularly relates to a host-aware cleaning method for a persistent cache in a tile recording disk. Background technique [0002] The explosive growth of data volume forces storage systems to seek devices with higher storage capacity. Disk is considered to be the storage solution that can meet urgent data storage capacity growth needs immediately, and is the solution that achieves the best balance between cost, capacity and performance. However, as the traditional magnetic recording technology is approaching the theoretical limit of the unit areal density of the magnetic disk determined by the superparamagnetic effect, the capacity of the traditional magnetic disk is also approaching the limit it can achieve. [0003] The tile recording technology further uses the space between the disk tracks to obtain a higher storage density per unit area than the traditional magnetic recordin...

AI Technical Summary

Problems solved by technology

[0005] The capacity of the persistent cache is relatively small, and it is time-consuming to migrate data from the persistent cache to the track area. The existing tile record conversion layer (STL) tile record disk scheme and the optimization scheme based on the tile record conversion layer are helpful Reduces unnecessary data movement between persistent caches and tracks, but underutilizes persistent caches for watt-record disks

The performance of tile-logging disks can be greatly degraded when requests from the host conflict with operations that clean up the persistent cache within the tile-logging disk

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