RAID0的学习

最新推荐文章于 2025-05-17 19:36:31 发布

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本文介绍了RAID0的特点，至少需两块硬盘，读写速度快但安全性不高。还详细说明了其配置过程，包括添加硬盘、安装、查找帮助文档、磁盘分区、创建RAID0、查看状态、分区、格式化、创建目录及挂载等操作。

raid0
至少需要两块
读写速度快，但安全性不高
1.添加硬盘

[root@localhost ~]# lsblk
NAME     MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda        8:0    0   20G  0 disk 
├─sda1     8:1    0  500M  0 part /boot
└─sda2     8:2    0 19.5G  0 part 
  ├─centos-root
         253:0    0 17.5G  0 lvm  /
  └─centos-swap
         253:1    0    2G  0 lvm  [SWAP]
sdb        8:16   0    5G  0 disk 
sdc        8:32   0    5G  0 disk 
sdd        8:48   0    5G  0 disk 
sr0       11:0    1    4G  0 rom

2.安装
[root@localhost ~]# yum instll mdadm -y
3.帮助文档的查找
[root@localhost ~]# mdadm --help-options
4.磁盘分区

[root@localhost ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xf7afde69.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 
First sector (2048-10485759, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-10485759, default 10485759): +1G
Partition 1 of type Linux and of size 1 GiB is set

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
Partition number (2-4, default 2): 
First sector (2099200-10485759, default 2099200): 
Using default value 2099200
Last sector, +sectors or +size{K,M,G} (2099200-10485759, default 10485759): +1G
Partition 2 of type Linux and of size 1 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

5.创建

[root@localhost ~]# mdadm -C /dev/md0 -l 0 -n 2 /dev/sdb1 /dev/sdb2
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

-C /dev/命名
-l 等级
-n 数量
6.查看所有运行的RAID阵列的状态

[root@localhost ~]# cat /proc/mdstat
Personalities : [raid0] 
md0 : active raid0 sdb2[1] sdb1[0]
      2095104 blocks super 1.2 512k chunks
      
unused devices: <none>

查询uuid

[root@localhost ~]# mdadm -Ds
ARRAY /dev/md0 metadata=1.2 name=localhost.localdomain:0 UUID=20f1b3d2:257a15a9:d1d930c7:d33d2e84

查询详细信息

[root@localhost ~]# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue Dec 29 01:37:22 2020
     Raid Level : raid0
     Array Size : 2095104 (2046.34 MiB 2145.39 MB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Tue Dec 29 01:37:22 2020
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 512K

           Name : localhost.localdomain:0  (local to host localhost.localdomain)
           UUID : 20f1b3d2:257a15a9:d1d930c7:d33d2e84
         Events : 0

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       18        1      active sync   /dev/sdb2

给raid0分区

[root@localhost ~]# fdisk /dev/md0

格式化

[root@localhost ~]# mkfs.ext4 /dev/md0p1

创建目录

[root@localhost ~]# mkdir /opt/md0

挂载

[root@localhost ~]# mount /dev/md0p1  /opt/md0/

查看

[root@localhost ~]# df -h
/dev/md0p1               976M  2.6M  907M   1% /opt/md0