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Linux軟raid

1 什么是RAID

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RAID全稱是獨立磁盤冗余陣列（Redundant Array of Independent Disks），基本思想是把多個磁盤組合起來，組合一個磁盤陣列組，使得性能大幅提高。

RAID分為幾個不同的等級，各個不同的等級均在數(shù)據(jù)可靠性及讀寫性能做了不同的權衡。實際工作中根據(jù)自己的業(yè)務需求選擇不同的RAID方案。
2 RAID的實現(xiàn)方式

外接式磁盤陣列：通過擴展卡提供適配能力
內接式RAID：主板集成RAID控制器安裝OS前在BIOS里配置
軟件RAID：通過OS實現(xiàn)

3 標準的RAID
3.1 RAID0

RAID0稱為條帶化存儲，將數(shù)據(jù)分段存儲在各個磁盤中，讀寫均可以并行處理，因此讀寫速率為單個磁盤的N倍，沒有冗余功能，任何一個磁盤的損壞就會導致的數(shù)據(jù)不可用。

3.2 RAID1

RADI1是鏡像存儲，沒有數(shù)據(jù)校驗，數(shù)據(jù)被同等的寫入到2個或者多個磁盤中，寫入速度相對慢， 但是讀取速度比較快。

3.3 RAID 4

RADI4在RAID1的基礎上，N個盤用于數(shù)據(jù)存儲，另外加入了1個磁盤作為校驗盤。一共N+1個盤，任何一個盤壞掉也不影響數(shù)據(jù)的訪問
3.4 RAID 5

RAID5在RAID4的基礎上，由原來的一個盤來存儲校驗數(shù)據(jù)，改為每個盤都有數(shù)據(jù)和校驗信息的。

4 混合RAID
4.1 RAID01

先組成RAID0,然后組成RAID1.

4.2 RAID10

先組成RAID1,然后組成RAID0

5 軟RAID的實現(xiàn)
5.1 RAID5的實現(xiàn)

創(chuàng)建由三塊硬盤組成的可用空間為2G的RAID5設備，要求其chunk大小為256k，文件系統(tǒng)為ext4，開機可自動掛載至/mydata目錄
5.1.1 先看看我們的磁盤情況

[root@centos7 Bash]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 128G 0 part
├─sda3 8:3 0 48.8G 0 part /
├─sda4 8:4 0 512B 0 part
└─sda5 8:5 0 19.5G 0 part /app
sdb 8:16 0 100G 0 disk
sdc 8:32 0 20G 0 disk
sdd 8:48 0 20G 0 disk
sde 8:64 0 20G 0 disk
sdf 8:80 0 20G 0 disk
sr0 11:0 1 8.1G 0 rom /run/media/root/CentOS 7 x86_64　

這里我們使用sdb,sdc,sdd,每個盤創(chuàng)建一個主分區(qū)1G,構建RADI5.
5.1.2 根據(jù)實際情況分區(qū)
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[root@centos7 Bash]$ 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 0x93d380cf.

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 (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199): +1G
Partition 1 of type Linux and of size 1 GiB is set

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x93d380cf

Device Boot Start End Blocks Id System
/dev/sdb1 2048 2099199 1048576 fd Linux raid autodetect

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

Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos7 Bash]$ fdisk /dev/sdc
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 0xc56b90d8.

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 (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): +1G
Partition 1 of type Linux and of size 1 GiB is set

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'

Command (m for help): p

Disk /dev/sdc: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xc56b90d8

Device Boot Start End Blocks Id System
/dev/sdc1 2048 2099199 1048576 fd Linux raid autodetect

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

Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos7 Bash]$ fdisk /dev/sdd
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 0x7e0900d8.

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 (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): +1G
Partition 1 of type Linux and of size 1 GiB is set

Command (m for help): p

Disk /dev/sdd: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x7e0900d8

Device Boot Start End Blocks Id System
/dev/sdd1 2048 2099199 1048576 83 Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'

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

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

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5.1.3 創(chuàng)建raid
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[root@centos7 Bash]$ mdadm -C /dev/md5 -a yes -l 5 -n 3 /dev/sd{b1,c1,d1} -c 256 # -C指定創(chuàng)建， -a yes 自動創(chuàng)建設備 ， -l 設定level , -n 設定磁盤個數(shù)， -c chunk大小
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md5 started.
[root@centos7 Bash]$ mdadm -Ds # 查看信息
ARRAY /dev/md5 metadata=1.2 name=centos7.magedu.com:5 UUID=2c8ae60d:a799fcb7:9008a046:ae6ea430
[root@centos7 Bash]$ mdadm -Ds >/etc/mdadm.conf # 將軟raid信息寫入到配置文件中去
[root@centos7 Bash]$ mkdir /mnt/md5 # 創(chuàng)建掛載點目錄
[root@centos7 Bash]$ mkfs.ext4 /dev/md5 # 創(chuàng)建文件系統(tǒng)
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=64 blocks, Stripe width=128 blocks
131072 inodes, 523776 blocks
26188 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=536870912
16 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912

Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

[root@centos7 Bash]$ mount /dev/md5 /mnt/md5 # 掛載設備
[root@centos7 Bash]$ tail -n 1 /etc/mtab
/dev/md5 /mnt/md5 ext4 rw,seclabel,relatime,stripe=128,data=ordered 0 0 # 查看掛載信息
[root@centos7 Bash]$ tail -n 1 /etc/mtab >>/etc/fstab #添加到fstab文件中，確保開機啟動，這里建議使用uuid

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5.1.4 驗證raid
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[root@centos7 md5]$ mdadm -D /dev/md5 #查看詳細raid5詳細信息，可以發(fā)現(xiàn)有3個都是working狀態(tài)的
/dev/md5:
Version : 1.2
Creation Time : Wed Dec 6 19:28:22 2017
Raid Level : raid5
Array Size : 2095104 (2046.00 MiB 2145.39 MB)
Used Dev Size : 1047552 (1023.00 MiB 1072.69 MB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent

   Update Time : Wed Dec  6 19:39:06 2017
         State : clean 
Active Devices : 3

Working Devices : 3
Failed Devices : 0
Spare Devices : 0

        Layout : left-symmetric
    Chunk Size : 256K

Consistency Policy : resync

          Name : centos7.magedu.com:5  (local to host centos7.magedu.com)
          UUID : 2c8ae60d:a799fcb7:9008a046:ae6ea430
        Events : 18

Number   Major   Minor   RaidDevice State
   0       8       17        0      active sync   /dev/sdb1
   1       8       33        1      active sync   /dev/sdc1
   3       8       49        2      active sync   /dev/sdd1

[root@centos7 md5]$ man mdadm
[root@centos7 md5]$ mdadm /dev/md5 -f /dev/sdc1 # -f 設定指定設備故障， 將/dev/sdc1 這個盤標記失敗， 看是否數(shù)據(jù)能訪問，我這里使用-f標記失敗，工作中可以根據(jù)硬盤指示燈判斷磁盤狀態(tài)
mdadm: set /dev/sdc1 faulty in /dev/md5
[root@centos7 md5]$ mdadm -D /dev/md5 #在次查看信息，發(fā)現(xiàn)工作的是2個， 一個失敗的設備
/dev/md5:
Version : 1.2
Creation Time : Wed Dec 6 19:28:22 2017
Raid Level : raid5
Array Size : 2095104 (2046.00 MiB 2145.39 MB)
Used Dev Size : 1047552 (1023.00 MiB 1072.69 MB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent

   Update Time : Wed Dec  6 19:41:08 2017
         State : clean, degraded                                                             # 這里注意了。 我們的一個盤壞掉了。 raid5狀態(tài)為降級使用了。
Active Devices : 2

Working Devices : 2
Failed Devices : 1
Spare Devices : 0

        Layout : left-symmetric
    Chunk Size : 256K

Consistency Policy : resync

          Name : centos7.magedu.com:5  (local to host centos7.magedu.com)
          UUID : 2c8ae60d:a799fcb7:9008a046:ae6ea430
        Events : 20

Number   Major   Minor   RaidDevice State
   0       8       17        0      active sync   /dev/sdb1
   -       0        0        1      removed
   3       8       49        2      active sync   /dev/sdd1

   1       8       33        -      faulty   /dev/sdc1

[root@centos7 md5]$ cat a.txt # 發(fā)現(xiàn)我們的數(shù)據(jù)還是能訪問的。沒有問題。

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5.1.5 替換設備

我這里是磁盤壞掉后的執(zhí)行替換的， 完全可以多一個備用盤， 壞掉自動替換的。
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[root@centos7 md5]$ mdadm /dev/md5 -a /dev/sde1 # 上面我們的sdc1數(shù)據(jù)損壞，我們需要更換新的磁盤來頂替他的位置。這里添加一個sde1的磁盤， fdisk操作這里省去了。
mdadm: added /dev/sde1
[root@centos7 md5]$ mdadm -Ds # 查看詳細信息
ARRAY /dev/md5 metadata=1.2 name=centos7.magedu.com:5 UUID=2c8ae60d:a799fcb7:9008a046:ae6ea430
[root@centos7 md5]$ mdadm -D /dev/md5 # 查看詳細信息
/dev/md5:
Version : 1.2
Creation Time : Wed Dec 6 19:28:22 2017
Raid Level : raid5
Array Size : 2095104 (2046.00 MiB 2145.39 MB)
Used Dev Size : 1047552 (1023.00 MiB 1072.69 MB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent

   Update Time : Wed Dec  6 19:50:01 2017
         State : clean                                                  # 狀態(tài)恢復正常了。沒有問題
Active Devices : 3

Working Devices : 3
Failed Devices : 1
Spare Devices : 0

        Layout : left-symmetric
    Chunk Size : 256K

Consistency Policy : resync

          Name : centos7.magedu.com:5  (local to host centos7.magedu.com)
          UUID : 2c8ae60d:a799fcb7:9008a046:ae6ea430
        Events : 43

Number   Major   Minor   RaidDevice State
   0       8       17        0      active sync   /dev/sdb1
   4       8       65        1      active sync   /dev/sde1
   3       8       49        2      active sync   /dev/sdd1

   1       8       33        -      faulty   /dev/sdc1             # 這個盤是壞掉的，我們已經加入了新的磁盤， 這個盤可以干掉了

[root@centos7 md5]$ man mdadm
[root@centos7 md5]$ mdadm /dev/md5 --remove /dev/sdc1 # 這個盤我們從raid5中移除去。
mdadm: hot removed /dev/sdc1 from /dev/md5

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5.1.6擴展raid

我們上面使用的是2+1構成的raid5,磁盤利用率為66%，如果我們想改成3+1 可以執(zhí)行類似如下命令

[root@centos7 mnt]$ mkadm -G -r /dev/md5 -n 4 -a /dev/sdxx # 這里我就不測試了。使用/dev/sdxx代替一個設備。-G 是Grown增長的意思，-r 是resizefs的意思，

5.1.7 清空raid信息
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[root@centos7 mnt]$ umount /dev/md5 # 卸載設備
[root@centos7 mnt]$ mdadm -S /dev/md5 # 停止raid5
mdadm: stopped /dev/md5
[root@centos7 mnt]$ sed -i '$d' /etc/fstab # 刪除fstab中關于raid5掛載的行
[root@centos7 mnt]$ cat /etc/fstab # 確保fstab沒有大問題

#

/etc/fstab

Created by anaconda on Tue Nov 7 16:07:01 2017

#

Accessible filesystems, by reference, are maintained under '/dev/disk'

See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

UUID=59ccea87-3c4e-4bbc-9e2f-3fadb1dcf2e6 / ext4 defaults 1 1
UUID=f4e867e8-bcde-43a2-adc7-c80b0948e85f /app ext4 noatime,usrquota,grpquota 1 2
UUID=1d6cbe88-ffb4-4adf-bacf-76be1fa75708 /boot ext4 defaults 1 2
#UUID=b2c064f5-1ee5-4b5c-9e75-ed41cb99c5aa swap swap defaults 0 0
#UUID=a0516c4f-40e6-4919-905a-8b44db12ff7b swap swap defaults,pri=0 0 0
#/dev/sdb2 /test ext4 rw,seclabel,relatime,data=ordered 0 0
#/dev/sdb1 /home xfs rw,seclabel,relatime,attr2,inode64,usrquota,grpquota 0 0
[root@centos7 mnt]$ rm -rf /etc/mdadm.conf # 刪除raid默認配置文件

[root@centos7 mnt]$ mdadm --zero-superblock /dev/sd{b1,e1,d1,c1} # 清空設置上的超級塊信息

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5.2 RAID10的實現(xiàn)

raid10 ，6個分區(qū)，2個一組raid1,3組raid0
5.2.1 案例分析

分析下，我們創(chuàng)建一個raid10設置，2個設備組成一個raid1,6個設備2個一組可以組成3個raid1, 然后把3個raid1組成一個raid0即可
5.2.2 先創(chuàng)建6個設備
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[root@centos7 mnt]$ lsblk # 就是使用fdisk 創(chuàng)建的設備， 具體這里就不寫了。 最終使用lsblk顯示，我們可以看到sdb1,sdb2,sdd1,sde1一共6個磁盤
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 128G 0 part
├─sda3 8:3 0 48.8G 0 part /
├─sda4 8:4 0 512B 0 part
└─sda5 8:5 0 19.5G 0 part /app
sdb 8:16 0 100G 0 disk
├─sdb1 8:17 0 1G 0 part
└─sdb2 8:18 0 1G 0 part
sdc 8:32 0 20G 0 disk
├─sdc1 8:33 0 1G 0 part
└─sdc2 8:34 0 1G 0 part
sdd 8:48 0 20G 0 disk
└─sdd1 8:49 0 1G 0 part
sde 8:64 0 20G 0 disk
└─sde1 8:65 0 1G 0 part
sdf 8:80 0 20G 0 disk
sr0 11:0 1 8.1G 0 rom /run/media/root/CentOS 7 x86_64

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5.2.3 創(chuàng)建raid
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[root@centos7 mnt]$ mdadm -C /dev/md11 -a yes -l 1 -n 2 /dev/sd{b1,c1} # 創(chuàng)建第一個raid1
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Wed Dec 6 19:28:22 2017
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Wed Dec 6 19:28:22 2017
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md11 started.
[root@centos7 mnt]$ mdadm -C /dev/md12 -a yes -l 1 -n 2 /dev/sd{b2,c2} #創(chuàng)建第二個raid1
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md12 started.
[root@centos7 mnt]$ mdadm -C /dev/md13 -a yes -l 1 -n 2 /dev/sd{d1,e1} # 創(chuàng)建第三個raid1
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Wed Dec 6 19:28:22 2017
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: /dev/sde1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Wed Dec 6 19:28:22 2017
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md13 started.
[root@centos7 mnt]$ mdadm -C /dev/md10 -a yes -l 0 -n 3 /dev/md{11,12,13} # 將3個raid1 合并為一個raid0
mdadm: /dev/md11 appears to contain an ext2fs file system
size=2095104K mtime=Wed Dec 6 19:29:45 2017
mdadm: /dev/md13 appears to contain an ext2fs file system
size=2095104K mtime=Wed Dec 6 19:29:45 2017
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md10 started.
[root@centos7 mnt]$ mkfs.ext
mkfs.ext2 mkfs.ext3 mkfs.ext4
[root@centos7 mnt]$ mkfs.ext4 /dev/md10 # 創(chuàng)建文件系統(tǒng)
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=384 blocks
196224 inodes, 784896 blocks
39244 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=805306368
24 block groups
32768 blocks per group, 32768 fragments per group
8176 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912

Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

[root@centos7 mnt]$ mdadm -Ds # 查看配置信息
ARRAY /dev/md11 metadata=1.2 name=centos7.magedu.com:11 UUID=0ce2cd6c:cd21fab6:3e65cfb5:64bd86f3
ARRAY /dev/md12 metadata=1.2 name=centos7.magedu.com:12 UUID=8af31dff:efab06ed:48e2613b:a599c774
ARRAY /dev/md13 metadata=1.2 name=centos7.magedu.com:13 UUID=a8c99d60:2d0c61e7:97a76809:9396c020
ARRAY /dev/md10 metadata=1.2 name=centos7.magedu.com:10 UUID=50b2fa58:4ce65d67:8c50c853:fa175a28
[root@centos7 mnt]$ mdadm -Ds >> /etc/mdadm.conf # 寫配置文件到mdadm的配置文件中
[root@centos7 mnt]$ mkdir /mnt/md10 # 創(chuàng)建掛載目錄
[root@centos7 mnt]$ mount /dev/md10 /mnt/md10 # 掛載文件系統(tǒng)
[root@centos7 mnt]$ tail -n 1 /etc/mtab # 查看mtab文件中的最后一行， 也就是我們的md10掛載信息
/dev/md10 /mnt/md10 ext4 rw,seclabel,relatime,stripe=384,data=ordered 0 0
[root@centos7 mnt]$ tail -n 1 /etc/mtab >> /etc/fstab #添加到開機啟動

復制代碼
5.2.4 raid 清除工作
復制代碼

[root@centos7 mnt]$ umount /dev/md10 # 取消掛載
[root@centos7 mnt]$ rm -rf /etc/mdadm.conf # 刪除mdadm的默認配置
[root@centos7 mnt]$ mdadm -S /dev/md10 # 停止raid0設置
mdadm: stopped /dev/md10
[root@centos7 mnt]$ mdadm -S /dev/md11 # 停止raid1設置
mdadm: stopped /dev/md11
[root@centos7 mnt]$ mdadm -S /dev/md12 # 停止radi1 設置
mdadm: stopped /dev/md12
[root@centos7 mnt]$ mdadm -S /dev/md13 # 停止raid 1 設置
mdadm: stopped /dev/md13
[root@centos7 mnt]$ sed -i '$d' /etc/fstab # 刪除fstab的掛載
[root@centos7 mnt]$ cat /etc/fstab # 確保正確

#

/etc/fstab

Created by anaconda on Tue Nov 7 16:07:01 2017

#

Accessible filesystems, by reference, are maintained under '/dev/disk'

See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

UUID=59ccea87-3c4e-4bbc-9e2f-3fadb1dcf2e6 / ext4 defaults 1 1
UUID=f4e867e8-bcde-43a2-adc7-c80b0948e85f /app ext4 noatime,usrquota,grpquota 1 2
UUID=1d6cbe88-ffb4-4adf-bacf-76be1fa75708 /boot ext4 defaults 1 2
#UUID=b2c064f5-1ee5-4b5c-9e75-ed41cb99c5aa swap swap defaults 0 0
#UUID=a0516c4f-40e6-4919-905a-8b44db12ff7b swap swap defaults,pri=0 0 0
#/dev/sdb2 /test ext4 rw,seclabel,relatime,data=ordered 0 0
#/dev/sdb1 /home xfs rw,seclabel,relatime,attr2,inode64,usrquota,grpquota 0 0
[root@centos7 mnt]$ mdadm -D # 再次查看下mdadm信息，確保沒有了
mdadm: No devices given.
[root@centos7 mnt]$ mdadm --zero-superblock /dev/sd{b1,b2,c1,c2,d1,e1} # 請求md的元數(shù)據(jù)信息


本文標題：Linux軟raid
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