使用mdadm命令来创建RAID磁盘阵列，关于mdadm详细用法请参考man mdadm
使用fdisk对需要使用的磁盘进行格式化
使用如下命令：
mdadm -C -v /dev/md6 -a yes -l 6 -n 7 /dev/sd[b-h]1此处列出目前使用到的参数介绍：
- -C: 创建选项
- -v: 显示详细过程
- /dev/md6: 创建raid卷后的存放路径
- -l 6: raid级别
- -n 7: 创建raid卷所需要的磁盘数
- /dev/sd[b-h]1: 构建raid卷的具体磁盘
root@devops-PC:~# mdadm -D /dev/md6
/dev/md6:
Version : 1.2
Creation Time : Wed Mar 3 10:27:15 2021
Raid Level : raid6
Array Size : 2929646080 (2793.93 GiB 2999.96 GB)
Used Dev Size : 585929216 (558.79 GiB 599.99 GB)
Raid Devices : 7
Total Devices : 7
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed Mar 3 10:29:36 2021
State : clean, resyncing
Active Devices : 7
Working Devices : 7
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : bitmap
Resync Status : 3% complete
Name : devops-PC:6 (local to host devops-PC)
UUID : e0e63169:752d5cab:df0efcea:98b1f6dd
Events : 28
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
2 8 48 2 active sync /dev/sdd
3 8 64 3 active sync /dev/sde
4 8 80 4 active sync /dev/sdf
5 8 96 5 active sync /dev/sdg
6 8 112 6 active sync /dev/sdhroot@devops-PC:~# mkfs.ext4 /dev/md6
mke2fs 1.44.5 (15-Dec-2018)
Creating filesystem with 732410240 4k blocks and 183107584 inodes
Filesystem UUID: f2ee12a8-2c96-48d5-af11-f555d2eef1f5
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848, 512000000, 550731776, 644972544
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information:
done - 首先确定挂载目录，没有则创建一个
mkdir -p /media/md6- 查看分区信息，使用
blkid获取挂载磁盘的uuid
root@devops-PC:~# blkid
/dev/sde1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="8c577c73-7874-cc59-8c3e-4af69b60f1ca" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="692e402e-6a02-6049-8522-2e734dadac9c"
/dev/sda1: UUID="4C24-B439" TYPE="vfat" PARTUUID="9a968dec-f86a-4777-a7e5-ba9f1354001f"
/dev/sda2: UUID="02055532-ca10-44c8-9003-c953361e99f8" TYPE="swap" PARTUUID="bb280c49-f29a-430f-a08a-66047dfd4259"
/dev/sda3: UUID="a3de0611-85fa-45d4-b1dc-f9155d351677" TYPE="ext4" PARTUUID="49887d7f-f912-4c65-b71b-6d9c43998653"
/dev/sdc1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="081a3a35-773f-894e-e016-ac1b7f665c24" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="f7be70bf-420b-e448-83ce-5474e3ff6851"
/dev/sdb1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="f01c0367-8cc4-d072-2b36-d499c68cca9d" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="1ddccb32-0b02-9748-81c7-7ac56a7c516e"
/dev/sdd1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="57c7a45e-9480-afb9-2ecd-c80dbbf66caf" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="a0d9a6a1-944b-114c-b5ef-808f30992143"
/dev/sdf1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="4b103385-cdf4-84ef-484f-e00f1d33b784" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="565a9e39-629f-1441-8daa-ed8e78053d88"
/dev/sdg1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="b0ec4128-95a8-157a-198c-862f996fd9c2" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="f8c4966c-0d68-8f47-8af5-ed9ab0689d02"
/dev/sdh1: UUID="519f7038-2bfe-d51e-42cb-ce1c30127df3" UUID_SUB="e6a043a8-4f39-ba9f-a68c-bcc234ad5166" LABEL="devops-PC:6" TYPE="linux_raid_member" PARTUUID="4a9c3ae2-94ee-3c40-a8ce-c90f4a33ae97"
/dev/md6: UUID="f2ee12a8-2c96-48d5-af11-f555d2eef1f5" TYPE="ext4"- 获取到UUID后，在/etc/fstab表中，写入自动挂载条目
- 编写fstab条目说明
<fs spec> <fs file> <fs vfstype> <fs mntops> <fs freq> <fs passno>
具体说明，以挂载/dev/sdb1为例：
<fs spec>：分区定位，可以给UUID或LABEL，例如：UUID=f2ee12a8-2c96或LABEL=software
<fs file>：具体挂载点的位置，例如：/media/md6
<fs vfstype>：挂载磁盘类型，linux分区一般为ext4，windows分区一般为ntfs
<fs mntops>：挂载参数，一般为defaults
<fs freq>：磁盘检查，默认为0
<fs passno>：磁盘检查，默认为0，不需要检查
- 编写示例
root@devops-PC:~# cat /etc/fstab
# /dev/sda3
UUID=a3de0611-85fa-45d4-b1dc-f9155d351677 / ext4 rw,relatime 0 1
# /dev/sda1
UUID=4C24-B439 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 2
# /dev/sda2
UUID=02055532-ca10-44c8-9003-c953361e99f8 none swap defaults,pri=-2 0 0
# /dev/md6
UUID=f2ee12a8-2c96-48d5-af11-f555d2eef1f5 /media/md6 ext4 defaults 0 0
配置后，执行mount -a验证，是否有fstab条目的任何错误
root@devops-PC:/media/md6# mount -av
/ : ignored
/boot/efi : already mounted
none : ignored
/media/md6 : already mounted确保上述没有问题后，将raid6的配置信息，保存起来，需要写入/etc/mdadm/mdadm.conf文件中
root@devops-PC:/media/md6# mdadm --detail --scan --verbose >> /etc/mdadm/mdadm.conf
root@devops-PC:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# !NB! Run update-initramfs -u after updating this file.
# !NB! This will ensure that initramfs has an uptodate copy.
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default (built-in), scan all partitions (/proc/partitions) and all
# containers for MD superblocks. alternatively, specify devices to scan, using
# wildcards if desired.
#DEVICE partitions containers
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# This configuration was auto-generated on Thu, 28 Jan 2021 08:19:55 +0000 by mkconf
ARRAY /dev/md6 level=raid6 num-devices=7 metadata=1.2 name=devops-PC:6 UUID=519f7038:2bfed51e:42cbce1c:30127df3
devices=/dev/sdb1,/dev/sdc1,/dev/sdd1,/dev/sde1,/dev/sdf1,/dev/sdg1,/dev/sdh1执行update-initramfs -u更新引导文件，确保重启后，RAID的名称不会改变
root@devops-PC:/etc# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.19.0-arm64-server
cryptsetup: WARNING: The initramfs image may not contain cryptsetup binaries
nor crypto modules. If that's on purpose, you may want to uninstall the
'cryptsetup-initramfs' package in order to disable the cryptsetup initramfs
integration and avoid this warning.
I: The initramfs will attempt to resume from /dev/sda2
I: (UUID=02055532-ca10-44c8-9003-c953361e99f8)
I: Set the RESUME variable to override this.