磁盘管理 raid_mdr与mdd

磁盘管理 raid_mdr与mddmdadm命令来自于英文词组“multipledevicesadmin”的缩写,其功能是用于管理RAID磁盘阵列组

mdadm命令来自于英文词组“multiple devices admin”的缩写,其功能是用于管理RAID磁盘阵列组。作为Linux系统下软RAID设备的管理神器,mdadm命令可以进行创建、调整、监控、删除等全套管理操作。

语法格式:mdadm [参数] 设备名

参数大全

-D 显示RAID设备的详细信息

-A 加入一个以前定义的RAID

-l 指定RAID的级别

-n 指定RAID中活动设备的数目

-f 把RAID成员列为有问题,以便移除该成员

-r 把RAID成员移出RAID设备

-a 向RAID设备中添加一个成员
-S 停用RAID设备,释放所有资源

-x 指定初始RAID设备的备用成员的数量

 

先创四个分区

磁盘管理 raid_mdr与mdd

[root@compute ~]# mdadm -C /dev/md7 -n 3  -l 5 -x 1 /dev/sde{1,2,3,4}
mdadm: /dev/sde1 appears to be part of a raid array:
       level=raid5 devices=3 ctime=Tue Mar  7 17:24:53 2023
mdadm: /dev/sde2 appears to be part of a raid array:
       level=raid5 devices=3 ctime=Tue Mar  7 17:24:53 2023
mdadm: /dev/sde3 appears to be part of a raid array:
       level=raid5 devices=3 ctime=Tue Mar  7 17:24:53 2023
mdadm: /dev/sde4 appears to be part of a raid array:
       level=raid5 devices=3 ctime=Tue Mar  7 17:24:53 2023
mdadm: largest drive (/dev/sde4) exceeds size (2094080K) by more than 1%
Continue creating array? y
mdadm: Fail create md7 when using /sys/module/md_mod/parameters/new_array
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md7 started.
sde                                               8:64   0   10G  0 disk  
├─sde1                                            8:65   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
├─sde2                                            8:66   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
├─sde3                                            8:67   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
└─sde4                                            8:68   0    4G  0 part  
  └─md7                                           9:7    0    4G  0 raid5 
[root@compute ~]# mdadm -D /dev/md7 
/dev/md7:
           Version : 1.2
     Creation Time : Tue Mar  7 17:29:25 2023
        Raid Level : raid5
        Array Size : 4188160 (3.99 GiB 4.29 GB)
     Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
      Raid Devices : 3
     Total Devices : 4
       Persistence : Superblock is persistent

       Update Time : Tue Mar  7 17:29:36 2023
             State : clean 
    Active Devices : 3
   Working Devices : 4
    Failed Devices : 0
     Spare Devices : 1

            Layout : left-symmetric
        Chunk Size : 512K

Consistency Policy : resync

              Name : compute:7  (local to host compute)
              UUID : dcdfacfb:9b2f17cd:ce176b58:9e7c56a4
            Events : 18

    Number   Major   Minor   RaidDevice State
       0       8       65        0      active sync   /dev/sde1
       1       8       66        1      active sync   /dev/sde2
       4       8       67        2      active sync   /dev/sde3

       3       8       68        -      spare   /dev/sde4
mdadm -S /dev/md7  //一次性停止有个硬盘的阵列组

[root@compute ~]# mdadm -C /dev/md7 -x 1 -n 3 -l 5 /dev/sdd{1..4}
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Tue Mar  7 17:25:51 2023
mdadm: /dev/sdd2 appears to be part of a raid array:
level=raid5 devices=3 ctime=Tue Mar  7 17:25:51 2023
mdadm: largest drive (/dev/sdd4) exceeds size (2094080K) by more than 1%
Continue creating array? yes
mdadm: Fail create md7 when using /sys/module/md_mod/parameters/new_array
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md7 started.

└─cinder--volumes-cinder--volumes--pool       253:5    0   69G  0 lvm   
sdd                                               8:48   0   10G  0 disk  
├─sdd1                                            8:49   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
├─sdd2                                            8:50   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
├─sdd3                                            8:51   0    2G  0 part  
│ └─md7                                           9:7    0    4G  0 raid5 
└─sdd4                                            8:52   0    4G  0 part  
└─md7                                           9:7    0    4G  0 raid5 
sde                                               8:64   0   10G  0 disk  
[root@compute ~]# mdadm -D /dev/md7 
/dev/md7:
Version : 1.2
Creation Time : Wed Mar  8 14:52:00 2023
Raid Level : raid5
Array Size : 4188160 (3.99 GiB 4.29 GB)
Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent

Update Time : Wed Mar  8 14:52:11 2023
State : clean 
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1

Layout : left-symmetric
Chunk Size : 512K

Consistency Policy : resync

Name : compute:7  (local to host compute)
UUID : 700d9a77:0babc26d:3b5a6768:223d47a8
Events : 18

Number   Major   Minor   RaidDevice State
0       8       49        0      active sync   /dev/sdd1
1       8       50        1      active sync   /dev/sdd2
4       8       51        2      active sync   /dev/sdd3

3       8       52        -      spare   /dev/sdd4
[root@compute ~]# mdadm /dev/md7  -f /dev/sdd1
mdadm: set /dev/sdd1 faulty in /dev/md7
[root@compute ~]# mdadm -D /dev/md7           
/dev/md7:
Version : 1.2
Creation Time : Wed Mar  8 14:52:00 2023
Raid Level : raid5
Array Size : 4188160 (3.99 GiB 4.29 GB)
Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent

Update Time : Wed Mar  8 14:59:00 2023
State : clean, degraded, recovering 
Active Devices : 2
Working Devices : 3
Failed Devices : 1
Spare Devices : 1

Layout : left-symmetric
Chunk Size : 512K

Consistency Policy : resync

Rebuild Status : 66% complete

Name : compute:7  (local to host compute)
UUID : 700d9a77:0babc26d:3b5a6768:223d47a8
Events : 30

Number   Major   Minor   RaidDevice State
3       8       52        0      spare rebuilding   /dev/sdd4
1       8       50        1      active sync   /dev/sdd2
4       8       51        2      active sync   /dev/sdd3

0       8       49        -      faulty   /dev/sdd1
[root@compute ~]# mdadm /dev/md7  -r /dev/sdd1
mdadm: hot removed /dev/sdd1 from /dev/md7
[root@compute ~]# mdadm -D /dev/md7           
/dev/md7:
Version : 1.2
Creation Time : Wed Mar  8 14:52:00 2023
Raid Level : raid5
Array Size : 4188160 (3.99 GiB 4.29 GB)
Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent

Update Time : Wed Mar  8 15:00:22 2023
State : clean 
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Consistency Policy : resync

Name : compute:7  (local to host compute)
UUID : 700d9a77:0babc26d:3b5a6768:223d47a8
Events : 38

Number   Major   Minor   RaidDevice State
3       8       52        0      active sync   /dev/sdd4
1       8       50        1      active sync   /dev/sdd2
4       8       51        2      active sync   /dev/sdd3
[root@compute ~]# mdadm /dev/md7  -a /dev/sdd1
mdadm: added /dev/sdd1
[root@compute ~]# mdadm -D /dev/md7           
/dev/md7:
Version : 1.2
Creation Time : Wed Mar  8 14:52:00 2023
Raid Level : raid5
Array Size : 4188160 (3.99 GiB 4.29 GB)
Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent

Update Time : Wed Mar  8 15:01:29 2023
State : clean 
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1

Layout : left-symmetric
Chunk Size : 512K

Consistency Policy : resync

Name : compute:7  (local to host compute)
UUID : 700d9a77:0babc26d:3b5a6768:223d47a8
Events : 39

Number   Major   Minor   RaidDevice State
3       8       52        0      active sync   /dev/sdd4
1       8       50        1      active sync   /dev/sdd2
4       8       51        2      active sync   /dev/sdd3

5       8       49        -      spare   /dev/sdd1

 

今天的文章磁盘管理 raid_mdr与mdd分享到此就结束了,感谢您的阅读。

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