server disk array

目录

 简述

配置RAID磁盘

 检查是否安装mdadm软件

 创建磁盘分区（根据实际需求配置）

 查看RAID详细信息​编辑

 配置自动加载RAID软件

 维护RAID

Simulate a failed disk

 Disk rebuild is complete

 移除故障磁盘

 添加新磁盘

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 简述

RAID（ Redundant Array of Inexpensive Disks）称为廉价磁盘冗余阵列. RAID The basic idea is to combine multiple cheap small disks together,grouped into one large disk group,使性能达到或超过一个容量巨大、价格昂贵、Disk with fast read and write speed.

 目前 RAID 技术主要分为两种：基于硬件的RAIDtechnology and software-basedRAID 技术.在 Linux The system can be simulated by the software that comes with it RAID 功能,This saves buying expensive hardware RAID Controller fee,The disk can be greatly enhanced IO 性能和可靠性.Because it is implemented by software to simulate RAID 功能,So its configuration is flexible、管理方便.同时使用软件 RAID,还可以实现将几个物理磁盘合并成一个更大的虚拟设备,Thereby achieving the purpose of performance improvement and data redundancy.Of course hardware based RAID Solutions are more software based RAID Technology will outperform in performance,Specifically, the ability to detect and repair multiple-bit errors、错误磁盘自动检测和阵列重建等方面.

配置RAID磁盘

 检查是否安装mdadm软件

 创建磁盘分区（根据实际需求配置）

 

 Created for the convenience of this experiment4个主分区

创建/dev/md5 RAID级别为5 Active Disk Directory is 3 The backup disk is 1 使用/dev/sdb磁盘1-4
mdadm --create /dev/md5 --level=5 --raid-devices=3 --spare-devices=1 /dev/sdb[1-4]
It can be abbreviated as follows
mdadm -C /dev/md5 -l 5 -n 3 -x 1 /dev/sdb[1-4]

 查看RAID详细信息

 配置自动加载RAID软件

将RAID的配置信息放到/etc/mdadm.conf文件内(mdadm.conf文件需要手动创建)
mdadm --detail --scan > /etc/mdadm.conf
命令可简写为
mdadm -D -s > /etc/mdadm.conf

Enter the configuration file and manually modify it to the following format

 将创建的/dev/md5It can be mounted after formatting

 维护RAID

Simulate a failed disk

将/dev/md5中/dev/sdb2mark failure
mdadm /dev/md5 --fail /dev/sdb2
cat /proc/mdstat

 输入命令将/dev/sdb2Mark as failed disk,查看时RAIDDisk rebuilding replaces the failed disk with a spare

 Disk rebuild is complete

 The original spare disk can be seen here/dev/sdb4顶替了/dev/sdb2的工作   /dev/sdb2Status shows error

 移除故障磁盘

移除/dev/md5中的/dev/sdb2
mdadm /dev/md5 --remove /dev/sdb2
命令简写为
mdadm /dev/md5 -r /dev/sdb2

 添加新磁盘

Insert the new disk/dev/sdb2添加到/dev/md5中
mdadm /dev/md5 --add /dev/sdb2
命令简写为
mdadm /dev/md5 -a /dev/sdb2