mdadm Centos7 软RAID0安装配置

基础程序安装

# 使用yum安装
yum -y install gdisk mdadm

检查是否安装配置过RAID

# 检查设备是否已经做过raid
mdadm -E /dev/vd{b,c}

磁盘分区

# 对磁盘分区，
gdisk /dev/vdb

# 列出分区类型 L 
# 调整分区类型 t 
# Linux RAID类型 fd00 
# 保存配置 w 
# 确认 y

gdisk /dev/vdb
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1): 
First sector (34-41943006, default = 2048) or {+-}size{KMGTP}: 
Last sector (2048-41943006, default = 41943006) or {+-}size{KMGTP}: 
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): fd00
Changed type of partition to 'Linux RAID'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/vdb.
The operation has completed successfully.

gdisk /dev/vdc
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1): 
First sector (34-41943006, default = 2048) or {+-}size{KMGTP}: 
Last sector (2048-41943006, default = 41943006) or {+-}size{KMGTP}: 
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): fd00
Changed type of partition to 'Linux RAID'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/vdc.
The operation has completed successfully.

　　

验证分区定义是否为RAID

# 验证是否正确定义RAID

mdadm -E /dev/vd{b,c}

创建RAID

# 创建RAID0

mdadm -C /dev/md0 -l raid0 -n 2 /dev/vd{b,c}

-C #创建
-l #级别
-n #RAID设备数
最后指定原始设备

mdadm -C /dev/md0 -l raid0 -n 2 /dev/vd{b,c}
mdadm: partition table exists on /dev/vdb
mdadm: partition table exists on /dev/vdb but will be lost or
       meaningless after creating array
mdadm: partition table exists on /dev/vdc
mdadm: partition table exists on /dev/vdc but will be lost or
       meaningless after creating array
Continue creating array? 
Continue creating array? (y/n) 
Continue creating array? (y/n) y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

　　

检查RAID是否正确创建

# 查看是否创建RAID成功
cat /proc/mdstat

# 验证是否正确定义RAID
mdadm -E /dev/vd{b,c}

# 查看raid0信息
mdadm -D /dev/md0

格式化并挂载RAID

# 格式化文件系统
mkfs.xfs -f /dev/md0

# 创建挂在目录
mkdir /mnt/raid0

# 挂在raid0
mount /dev/md0 /mnt/raid0/

# 查看uuid，分区类型
blkid /dev/md0

# 添加自动挂载
vim /etc/fstab
/dev/md0                /mnt/raid0              xfs    defaults         0 0

# 检查fstab语法
mount -av

保存配置，以便停止后重新装配

# 保存RAID配置
echo DEVICE /dev/sd{b,c}1 > /etc/mdadm.conf
mdadm -Dvs >> /etc/mdadm.conf
 
mdadm -D -s -v >> /etc/mdadm.conf
mdadm --detail --scan --verbose >> /etc/mdadm.conf

cat /etc/mdadm.conf

清除raid0

#取消挂载
umount /dev/md0

# 停止raid0
mdadm -S /dev/md0

# 清除成员磁盘当中阵列的超级块信息 
mdadm --zero-superblock /dev/vd{b,c}

# 删除或注释/etc/fstab上的挂载信息
vi /etc/fstab
# /dev/md0                /mnt/raid0              xfs    defaults         0 0

重新装配

# 将已经停止的阵列重新装配
mdadm -A /dev/md0 /dev/vd{b,c}

# 自动装配，自动从/etc/mdadm.conf配置文件读取配置
mdadm -A /dev/md0