Members of this chapter and small partners to share a server-ying pieces of content and configuration of RAID, the following points were learning from
1. Server ying piece Detailed
2.RAID disk arrays Comments
3. Introduction array cards with the real machine configuration
The first is the introduction RAID disk array
1.RAID English Redundant Array of Independent Disk Abbreviation, Chinese referred to as redundant array of independent
2.RAID is the plurality of independent physical disk combined in different ways to form a disk group (logical drive), to provide higher than a single hard disk storage, and providing data backup technology xing
3. disk array composed of different ways known as RAID level (RAID levels), common RAID levels are as follows: RAID0, RAID1, RAID5, RAID6 , RAID1 + 0 Wait
RAID 0 disk array introduction
0 RAID
1.RAID consecutive 0 bits or bytes divided data, parallel read / write on a plurality of disks, and therefore has a high data transfer rate, but it has no data redundancy, and therefore can not be considered a true RAID structure
2.RAID 0 is simply to improve the type of energy, and there is no support for reliable data xing, and in which a disk failure will affect all of the data
3.RAID 0 can not be used in high-security data type requirements of the occasion
RAID 1 disk array Introduction
RAID 1
1. disk data mirroring is achieved by the redundant data, generate mutual backup data on the acceptance of independent disks
2. When the original data is busy, data can be read directly from the mirror volume copy, and thus can improve read RAID 1 xing can take
3.RAID 1 disk array is the highest unit costs, but provides high data security and available xing, when a disk fails, the system can automatically switch to the mirrored disk reader without fail recombinant The data
RAID 5 disk array Introduction
RAID 5
- N（N≥3）块盘组成阵列，一份数据产生N-1个条带，同时还有1分校验数据，共N份数据在N块盘上循环均衡存储
- N块盘同时读写，读xing能很高，但由于有校验机制的问题，写型能相对不高
- （N-1）/N容量
- 可靠性高，允许坏1块盘，不影响所有数据
RAID 6磁盘阵列介绍
RAID 6
- N（N≥4）块盘组成阵列，（N-2）/N容量
- 与RAID 5相比，RAID 6增加了第二个独立的奇偶校验信息块。两个独立的奇偶系统使用不同的算法，即使两块磁盘同时失效也不会影响数据的使用
- 相对于RAID 5有更大的“写损失”，因此写xing能较差
RAID 1+0磁盘阵列介绍
RAID 1+0
- N（偶数，N≥4）块盘两两镜像后，再组合成一个RAID 0
- N/2容量
- N/2块盘同时写入，N块盘同时读取
- xing能高，可靠xing高
阵列卡介绍：
- 阵列卡就是用来实现RAID功能的板卡，通常是由I/O处理器、硬盘控制器、硬盘连接器和缓存等一系列零组件构成的
- 不同的RAID卡支持的RAID功能不同，例如支持RAID 0、RAID 1、RAID 5、RAID 10等
- RAID卡的接口类型：IDE接口、SCSI接口和SAS接口
基础内容补充：
跨区卷：
在LINUX中代表LVM逻辑卷
特点：扩展性
组成条件：可以使大小不同的磁盘追加而成
容量：多块磁盘容量相加总和
带区卷：
在LINUX中也叫zuo条带卷 RAID 0
特点：高读写
缺点：不可靠
组成条件：大小相同的磁盘组成
容量：多块磁盘容量相加总和
镜像卷 raid1
特点：高可靠
缺点：不具备扩展xing
组成条件：大小相同的磁盘组成
容量：多块次盘额容量总和的一半
raid5 volume
characteristics: high read, write general, high reliability
composition conditions: at least three of the same size disk
capacity: n-1 n sum / disk capacity
raid10 = raid1 + 0
has the function of volume with the volume and area
These are the theoretical knowledge of Linux system and server hardware RAID configuration, small content of an article will be creation and verification testing of various type of volume, it will also create a software RAID disk arrays according to their own procedures