CN104268102A - Method for writing caches of storage servers in hybrid modes - Google Patents

Abstract

The invention provides a method for writing caches of storage servers in hybrid modes. The method has the advantages that the hybrid modes of a write-back process and a write-through process are adopted, and the write-back process is adopted when sufficient spaces are available in the caches of disks, so that the read-write performance can be improved; the write-through process is adopted when the spaces available in the caches of the disk are reduced and reach a certain threshold value, so that read-write and refresh frequencies of the caches of the disks can be reduced, and the read-write speeds of the caches of the disks can be increased to a certain degree.

Description

A kind of storage server adopts hybrid mode to write the method for buffer memory

Technical field

The present invention relates to Computer Storage server design technical field, specifically a kind of storage server adopts hybrid mode to write the method for buffer memory.

Background technology

Writing strategy is the important symbol distinguishing different disk caching design scheme.The strategy of writing that disk buffering is conventional has write-back and write through method.

Write-back (write back), does not write disk when namely performing write operation, but writes in the disk buffering in internal memory, just write back in disk when the data in disk buffering are replaced away.Data in the disk buffering of write-back can inconsistent with disk.A zone bit is set when writing disk buffering, when the data in disk buffering write back disk, removes this position.According to this value, in disk buffering, each block has two states: clear (clean) and turbid (dirty), when writing disk buffering, state is " turbid ", and when data write back disk, state is " clearly ".Write operation is consistent with the speed of internal memory, and the multi-pass operations of same is only needed to carry out single job to lower one deck storer, write-back needs less bandwidth of memory, for the storer of other levels and the use of memory bus less, save power consumption.

Write through method, also referred to as depositing through method, refers to when performing disk write operation, not only corresponding block in information write disk buffering, and corresponding block in write next stage storer.Data in disk buffering are always clean, and next stage stores up-to-date current data copy, simplifies data consistency.But the write operation of processor must wait for that the write operation of disk completes, and reduces read or write speed.

Summary of the invention

The object of this invention is to provide a kind of storage server adopts hybrid mode to write the method for buffer memory.

The object of the invention is to realize in the following manner, adopt write-back and write through method hybrid mode to write buffer memory, when there being enough free spaces in disk buffering, adopting write-back, improving readwrite performance; When the free space in disk buffering is down to a certain threshold values, adopt write through method, reduce read-write and the refreshing frequency of disk buffering, improve the read or write speed of disk buffering, concrete steps are as follows:

(1) when there being enough free spaces in disk buffering, the mode write back is adopted;

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block, if do not hit, then the region of memory that distribution one piece is idle, copy data in this region of memory, after some time, this dirty data is flushed in disk;

(2) when the free space in disk buffering is down to a certain threshold values, the mode of write through is adopted;

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block; If do not hit, then directly write data in disk, because the not hit in disk buffering of this write request, there will not be the situation that data are inconsistent.

Object beneficial effect of the present invention is: adopt write-back and write through method hybrid mode, when there being enough free spaces in disk buffering, adopting write-back, improving readwrite performance; When the free space in disk buffering is down to a certain threshold values, adopt write through method, reduce read-write and the refreshing frequency of disk buffering, improve the read or write speed of disk buffering to a certain extent.

Embodiment

Adopt write-back and write through method hybrid mode, when there being enough free spaces in disk buffering, adopting write-back, improving readwrite performance; When the free space in disk buffering is down to a certain threshold values, adopt write through method, reduce read-write and the refreshing frequency of disk buffering, improve the read or write speed of disk buffering to a certain extent.Concrete steps are as follows:

1) when there being enough free spaces in disk buffering, the mode write back is adopted;

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block, if do not hit, then the region of memory that distribution one piece is idle, copy data in this region of memory, after some time, this dirty data is flushed in disk;

2) when the free space in disk buffering is down to a certain threshold values, the mode of write through is adopted.

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block; If do not hit, then directly write data in disk, because the not hit in disk buffering of this write request, there will not be the situation that data are inconsistent.

Except the technical characteristic described in instructions, be the known technology of those skilled in the art.

Claims (1)

1. storage server adopts hybrid mode to write a method for buffer memory, it is characterized in that, adopts write-back and write through method hybrid mode to write buffer memory, when there being enough free spaces in disk buffering, adopting write-back, improving readwrite performance; When the free space in disk buffering is down to a certain threshold values, adopt write through method, reduce read-write and the refreshing frequency of disk buffering, improve the read or write speed of disk buffering, concrete steps are as follows:

(1) when there being enough free spaces in disk buffering, the mode write back is adopted;

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block, if do not hit, then the region of memory that distribution one piece is idle, copy data in this region of memory, after some time, this dirty data is flushed in disk;

(2) when the free space in disk buffering is down to a certain threshold values, the mode of write through is adopted;

When disk buffering receives write request, first search in disk buffering, if hit, then directly copy in corresponding block; If do not hit, then directly write data in disk, because the not hit in disk buffering of this write request, there will not be the situation that data are inconsistent.