软RAID搭建
Linux内核中有一个md（multiple devices）模块在底层管理RAID设置，他会在应用层提供一个应用程序的工具mdadm，mdadm是Linux下用于创建和管理软件RAID的命令。
mdadm命令常见参数：
|
-C或--creat |
建立一个新阵列 |
-r |
移除设备 |
|
-A |
激活磁盘阵列 |
-l 或--level= |
设定磁盘阵列的级别 |
|
-D或--detail |
打印阵列设备的详细信息 |
-n或--raid-devices= |
指定阵列成员（分区/磁盘）的数量 |
|
-s或--scan |
扫描配置文件或/proc/mdstat得到阵列缺失信息 |
-x或--spare-devicds= |
指定阵列中备用盘的数量 |
|
-f |
将设备状态定为故障 |
-c或--chunk= |
设定阵列的块chunk块大小，单位为KB |
|
-a或--add |
添加设备到阵列 |
-G或--grow |
改变阵列大小或形态 |
|
-v |
--verbose 显示详细信息 |
-S |
停止阵列 |
磁盘准备，关闭虚拟机，添加磁盘20块：
[root@localhost ~]# ls /dev/sd
sda sda2 sdb sdd sdf sdh sdj sdl sdn sdp sdr sdt
sda1 sda3 sdc sde sdg sdi sdk sdm sdo sdq sds sdu
RAID0
|
raid种类 |
磁盘 |
热备盘 |
|
raid0 |
sdb、sdc |
|
创建RAID0
[root@localhost dev]# mdadm -C -v /dev/md0 -l 0 -n 2 /dev/sdb /dev/sdc
mdadm: chunk size defaults to 512K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
查看RAID0阵列信息
[root@localhost dev]# mdadm -Ds
ARRAY /dev/md0 metadata=1.2 name=localhost.localdomain:0 UUID=3e7915c3:206f4f2b:c1b0fc8f:54ea6e37
[root@localhost dev]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon Dec 7 09:31:13 2020
Raid Level : raid0
Array Size : 20953088 (19.98 GiB 21.46 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Mon Dec 7 09:31:13 2020
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 512K
Consistency Policy : none
Name : localhost.localdomain:0 (local to host localhost.localdomain)
UUID : 3e7915c3:206f4f2b:c1b0fc8f:54ea6e37
Events : 0
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
格式化阵列
[root@localhost dev]# mkfs.xfs /dev/md0
meta-data=/dev/md0 isize=512 agcount=16, agsize=327296 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5236736, imaxpct=25
= sunit=128 swidth=256 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
阵列挂载
[root@localhost dev]# mkdir raid_0
[root@localhost dev]# mount /dev/md0 /dev/raid_0/
查看是否挂载成功
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 55G 3.9G 51G 8% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 13M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 497M 166M 332M 34% /boot
tmpfs 781M 4.0K 781M 1% /run/user/42
tmpfs 781M 24K 781M 1% /run/user/0
/dev/md0 20G 33M 20G 1% /dev/raid_0
阵列开机自动挂载
文件名挂载
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_0_wenjian_guazai
/dev/md0 /dev/raid_0 xfs defaults 0 0
UUID挂载
查看UUID
[root@localhost ~]# blkid /dev/md0
/dev/md0: UUID="f1c3bf57-4dda-4d7c-84e1-39ee319d8759" TYPE="xfs"
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_0_UUID_guazai
UUID=f1c3bf57-4dda-4d7c-84e1-39ee319d8759 /dev/raid_0 xfs defaults 0 0
RAID1
|
raid种类 |
磁盘 |
热备盘 |
|
raid1 |
sdd、sde、 |
sdf |
raid1+1（raid1加一块热备盘）
对于raid1来说，可以增加成员盘，也可以减少
创建RAID1
[root@localhost dev]#
[root@localhost dev]# mdadm -C -v /dev/md1 -l 1 -n 2 -x 1 /dev/sd[d,e,f]
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: size set to 10476544K
Continue creating array? (y/n) y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md1 started.
将RAID1阵列信息保存到/etc/mdadm.conf配置文件中
[root@localhost dev]# mdadm -Dsv > /etc/mdadm.conf
查看RAID1阵列信息
[root@localhost dev]# mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Mon Dec 7 09:44:00 2020
Raid Level : raid1
Array Size : 10476544 (9.99 GiB 10.73 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 2
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Dec 7 09:44:17 2020
State : clean
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Consistency Policy : resync
Name : localhost.localdomain:1 (local to host localhost.localdomain)
UUID : 6aa69cf9:255ef882:08b86b9a:679e6c6d
Events : 17
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
1 8 64 1 active sync /dev/sde
2 8 80 - spare /dev/sdf
格式化阵列
[root@localhost dev]# mkfs.xfs /dev/md1
meta-data=/dev/md1 isize=512 agcount=4, agsize=654784 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=2619136, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
阵列挂载
[root@localhost dev]# mkdir raid1
[root@localhost dev]# mount /dev/md1 /dev/raid1
查看阵列是否挂载成功
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 55G 3.9G 51G 8% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 13M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 497M 166M 332M 34% /boot
tmpfs 781M 4.0K 781M 1% /run/user/42
tmpfs 781M 24K 781M 1% /run/user/0
/dev/md0 20G 33M 20G 1% /dev/raid_0
/dev/md1 10G 33M 10G 1% /dev/raid1
阵列开机自动挂载
文件名挂载
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_1_wenjian_guazai
/dev/md1 /dev/raid1 xfs defaults 0 0
UUID挂载
查看UUID
[root@localhost ~]# blkid /dev/md1
/dev/md1: UUID="2e4fbf9d-1dfc-4280-bc31-6a71c620508e" TYPE="xfs"
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_1_UUID_guazai
UUID=2e4fbf9d-1dfc-4280-bc31-6a71c620508e /dev/raid1 xfs defaults 0 0
模拟磁盘损坏
模拟数据盘/dev/sde出现故障，观察热备盘/dev/sdf是否自动顶替故障盘。
将磁盘设定为故障
[root@localhost dev]# mdadm /dev/md1 -f /dev/sde
mdadm: set /dev/sde faulty in /dev/md1
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Mon Dec 7 09:44:00 2020
Raid Level : raid1
Array Size : 10476544 (9.99 GiB 10.73 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 2
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Dec 7 09:58:26 2020
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 1
Spare Devices : 0
Consistency Policy : resync
Name : localhost.localdomain:1 (local to host localhost.localdomain)
UUID : 6aa69cf9:255ef882:08b86b9a:679e6c6d
Events : 36
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
2 8 80 1 active sync /dev/sdf
1 8 64 - faulty /dev/sde
移除损坏磁盘
[root@localhost dev]# mdadm -r /dev/md1 /dev/sde
mdadm: hot removed /dev/sde from /dev/md1
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Mon Dec 7 09:44:00 2020
Raid Level : raid1
Array Size : 10476544 (9.99 GiB 10.73 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:08:56 2020
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : localhost.localdomain:1 (local to host localhost.localdomain)
UUID : 6aa69cf9:255ef882:08b86b9a:679e6c6d
Events : 37
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
2 8 80 1 active sync /dev/sdf
添加新热备盘
[root@localhost dev]# mdadm -a /dev/md1 /dev/sde
mdadm: added /dev/sde
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Mon Dec 7 09:44:00 2020
Raid Level : raid1
Array Size : 10476544 (9.99 GiB 10.73 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 2
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:10:38 2020
State : clean
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Consistency Policy : resync
Name : localhost.localdomain:1 (local to host localhost.localdomain)
UUID : 6aa69cf9:255ef882:08b86b9a:679e6c6d
Events : 38
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
2 8 80 1 active sync /dev/sdf
3 8 64 - spare /dev/sde
RAID5
|
raid种类 |
磁盘 |
热备盘 |
|
raid5 |
sdg、sdh、sdi |
sdj |
raid5+1（raid5加一块热备盘）
对于raid5来说，只能增加成员盘，不能减少
创建RAID5
[root@localhost dev]# mdadm -C -v /dev/md5 -l 5 -n 3 -x 1 -c 32 /dev/sd{g,h,i,j}
mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: size set to 10476544K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md5 started.
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md5
/dev/md5:
Version : 1.2
Creation Time : Mon Dec 7 10:14:48 2020
Raid Level : raid5
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:15:22 2020
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 32K
Consistency Policy : resync
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 45aa0f62:e27c2059:6a8ca67a:9495335d
Events : 18
Number Major Minor RaidDevice State
0 8 96 0 active sync /dev/sdg
1 8 112 1 active sync /dev/sdh
4 8 128 2 active sync /dev/sdi
3 8 144 - spare /dev/sdj
将RAID5阵列信息保存到/etc/mdadm.conf配置文件中
[root@localhost dev]# mdadm -Dsv >> /etc/mdadm.conf
格式化阵列
[root@localhost dev]# mkfs.xfs /dev/md5
meta-data=/dev/md5 isize=512 agcount=16, agsize=327384 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5238144, imaxpct=25
= sunit=8 swidth=16 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
阵列挂载
[root@localhost dev]# mkdir /dev/raid5
[root@localhost dev]# mount /dev/md5 /dev/raid5
查看阵列是否挂载成功
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 55G 3.9G 51G 8% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 13M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 497M 166M 332M 34% /boot
tmpfs 781M 4.0K 781M 1% /run/user/42
tmpfs 781M 24K 781M 1% /run/user/0
/dev/md0 20G 33M 20G 1% /dev/raid_0
/dev/md1 10G 33M 10G 1% /dev/raid1
/dev/md5 20G 33M 20G 1% /dev/raid5
阵列开机自动挂载
文件名挂载
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_1_wenjian_guazai
/dev/md5 /dev/raid5 xfs defaults 0 0
UUID挂载
[root@localhost ~]# blkid /dev/md5
/dev/md5: UUID="9906a44b-7cc1-4905-b651-e7ecbc07d531" TYPE="xfs"
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_1_UUID_guazai
UUID=2e4fbf9d-1dfc-4280-bc31-6a71c620508e /dev/raid1 xfs defaults 0 0
磁盘阵列扩容
查看是否同步
磁盘扩容前先确定数据是否同步完成。
[root@localhost ~]# mdadm -D /dev/md5
/dev/md5:
Version : 1.2
Creation Time : Mon Dec 7 10:14:48 2020
Raid Level : raid5
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:23:31 2020
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 32K
Consistency Policy : resync #下方有百分比，等待消失即同步完成。
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 45aa0f62:e27c2059:6a8ca67a:9495335d
Events : 18
Number Major Minor RaidDevice State
0 8 96 0 active sync /dev/sdg
1 8 112 1 active sync /dev/sdh
4 8 128 2 active sync /dev/sdi
3 8 144 - spare /dev/sdj
停止raid5阵列
[root@localhost ~]# mdadm -S /dev/md5
mdadm: Cannot get exclusive access to /dev/md5:Perhaps a running process, mounted filesystem or active volume group?
激活raid5阵列
[root@localhost ~]# mdadm -As
mdadm: Devices UUID-3e7915c3:206f4f2b:c1b0fc8f:54ea6e37 and UUID-3e7915c3:206f4f2b:c1b0fc8f:54ea6e37 have the same name: /dev/md0
mdadm: Duplicate MD device names in conf file were found.
热备盘增加到raid5
[root@localhost ~]# mdadm -G /dev/md5 -n 4 -c 32
将RAID5阵列信息保存到/etc/mdadm.conf配置文件中
[root@localhost ~]# mdadm -Dsv > /etc/mdadm.conf
查看阵列信息
[root@localhost ~]# mdadm -D /dev/md5
/dev/md5:
Version : 1.2
Creation Time : Mon Dec 7 10:14:48 2020
Raid Level : raid5
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:39:10 2020
State : clean, reshaping
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 32K
Consistency Policy : resync
Reshape Status : 59% complete #等待同步完成
Delta Devices : 1, (3->4)
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 45aa0f62:e27c2059:6a8ca67a:9495335d
Events : 51
Number Major Minor RaidDevice State
0 8 96 0 active sync /dev/sdg
1 8 112 1 active sync /dev/sdh
4 8 128 2 active sync /dev/sdi
3 8 144 3 active sync /dev/sdj
增加新热备盘
[root@localhost ~]# mdadm -a /dev/md5 /dev/sdk
mdadm: added /dev/sdk
查看阵列信息
[root@localhost ~]# mdadm -D /dev/md5
/dev/md5:
Version : 1.2
Creation Time : Mon Dec 7 10:14:48 2020
Raid Level : raid5
Array Size : 31429632 (29.97 GiB 32.18 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Mon Dec 7 10:44:25 2020
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 32K
Consistency Policy : resync
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 45aa0f62:e27c2059:6a8ca67a:9495335d
Events : 56
Number Major Minor RaidDevice State
0 8 96 0 active sync /dev/sdg
1 8 112 1 active sync /dev/sdh
4 8 128 2 active sync /dev/sdi
3 8 144 3 active sync /dev/sdj
5 8 160 - spare /dev/sdk
RAID6
RAID10
|
raid种类 |
磁盘 |
热备盘 |
|
raid10 |
sdl，sdm，sdn，sdo |
sdp |
创建RAID10
[root@localhost dev]# mdadm -C -v /dev/md10 -l 10 -n 4 -c 32 /dev/sd{l,m,n,o}
mdadm: layout defaults to n2
mdadm: layout defaults to n2
mdadm: size set to 10476544K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md10 started.
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md10
/dev/md10:
Version : 1.2
Creation Time : Mon Dec 7 11:00:18 2020
Raid Level : raid10
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Mon Dec 7 11:01:17 2020
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 32K
Consistency Policy : resync
Name : localhost.localdomain:10 (local to host localhost.localdomain)
UUID : 5917f27e:5ef95178:53a013da:23d603ad
Events : 17
Number Major Minor RaidDevice State
0 8 176 0 active sync set-A /dev/sdl
1 8 192 1 active sync set-B /dev/sdm
2 8 208 2 active sync set-A /dev/sdn
3 8 224 3 active sync set-B /dev/sdo
将RAID10阵列信息保存到/etc/mdadm.conf配置文件
[root@localhost dev]# mdadm -Dsv > /etc/mdadm.conf
格式化阵列
[root@localhost dev]# mkfs.xfs /dev/md10
meta-data=/dev/md10 isize=512 agcount=16, agsize=327384 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5238144, imaxpct=25
= sunit=8 swidth=16 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
阵列挂载
[root@localhost dev]# mkdir raid10
[root@localhost dev]# mount /dev/md10 /dev/raid10
查看阵列是否挂载成功
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 55G 3.9G 51G 8% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 13M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 497M 166M 332M 34% /boot
tmpfs 781M 4.0K 781M 1% /run/user/42
tmpfs 781M 24K 781M 1% /run/user/0
/dev/md0 20G 33M 20G 1% /dev/raid_0
/dev/md1 10G 33M 10G 1% /dev/raid1
/dev/md5 20G 33M 20G 1% /dev/raid5
/dev/md10 20G 33M 20G 1% /dev/raid10
阵列开机自动挂载
文件名挂载
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_1_wenjian_guazai
/dev/md10 /dev/raid10 xfs defaults 0 0
UUID挂载
查看UUID
[root@localhost dev]# blkid /dev/md10
/dev/md10: UUID="796de658-b357-464c-b1c8-4b4f641236ed" TYPE="xfs"
[root@localhost dev]# vim /etc/fstab
追加如下内容：
#raid_10_UUID_guazai
UUID=796de658-b357-464c-b1c8-4b4f641236ed /dev/raid10 xfs defaults 0 0
磁盘阵列扩容
添加新热备盘
[root@localhost dev]# mdadm -a /dev/md10 /dev/sdp
mdadm: added /dev/sdp
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md10
/dev/md10:
Version : 1.2
Creation Time : Mon Dec 7 11:00:18 2020
Raid Level : raid10
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Mon Dec 7 11:08:47 2020
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : near=2
Chunk Size : 32K
Consistency Policy : resync
Name : localhost.localdomain:10 (local to host localhost.localdomain)
UUID : 5917f27e:5ef95178:53a013da:23d603ad
Events : 18
Number Major Minor RaidDevice State
0 8 176 0 active sync set-A /dev/sdl
1 8 192 1 active sync set-B /dev/sdm
2 8 208 2 active sync set-A /dev/sdn
3 8 224 3 active sync set-B /dev/sdo
4 8 240 - spare /dev/sdp
热备盘增加到raid10
[root@localhost dev]# mdadm -G /dev/md10 -n 5 -c 32
查看阵列信息
[root@localhost dev]# mdadm -D /dev/md10
/dev/md10:
Version : 1.2
Creation Time : Mon Dec 7 11:00:18 2020
Raid Level : raid10
Array Size : 20953088 (19.98 GiB 21.46 GB)
Used Dev Size : 10476544 (9.99 GiB 10.73 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Mon Dec 7 11:11:38 2020
State : clean, reshaping
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 32K
Consistency Policy : resync
Reshape Status : 14% complete
Delta Devices : 1, (4->5)
Name : localhost.localdomain:10 (local to host localhost.localdomain)
UUID : 5917f27e:5ef95178:53a013da:23d603ad
Events : 61
Number Major Minor RaidDevice State
0 8 176 0 active sync /dev/sdl
1 8 192 1 active sync /dev/sdm
2 8 208 2 active sync /dev/sdn
3 8 224 3 active sync /dev/sdo
4 8 240 4 active sync /dev/sdp
RAID50
软RAID删除
取消挂载
[root@localhost dev]# umount /dev/md0 /dev/raid_0
umount: /dev/raid_0: not mounted
查看挂载是否取消
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 55G 3.9G 51G 8% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 13M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 497M 166M 332M 34% /boot
tmpfs 781M 4.0K 781M 1% /run/user/42
tmpfs 781M 24K 781M 1% /run/user/0
/dev/md1 10G 33M 10G 1% /dev/raid1
/dev/md5 20G 33M 20G 1% /dev/raid5
/dev/md10 20G 33M 20G 1% /dev/raid10
停止raid设备
[root@localhost dev]# mdadm -Ss /dev/md0
删除raid配置文件
[root@localhost dev]# vim /etc/mdadm.conf
删除如下信息：
ARRAY /dev/md0 level=raid0 num-devices=2 metadata=1.2 name=localhost.localdomain:0 UUID=3e7915c3:206f4f2b:c1b0fc8f:54ea6e37
devices=/dev/sdb,/dev/sdc
清除磁盘raid标识
用到哪块磁盘就要清除他的raid标识
[root@localhost dev]# mdadm --zero-superblock /dev/sdb
[root@localhost dev]# mdadm --zero-superblock /dev/sdc