我的 mdadm RAID1 是否正在執行？

抱歉這個愚蠢的問題，但我真的很困惑。

我的 RAID1 是否正在執行且狀況良好？

lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:    10
Codename:   buster
root@trekto:~# uname -a
Linux trekto 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2 (2020-04-29) x86_64 GNU/Linux

service mdadm status
● mdadm.service
  Loaded: masked (Reason: Unit mdadm.service is masked.)
  Active: inactive (dead)

看起來沒有執行但是：

lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda       8:0    0 74.5G  0 disk  
├─sda1    8:1    0  953M  0 part  
│ └─md0   9:0    0  952M  0 raid1 /boot
├─sda2    8:2    0 11.2G  0 part  
│ └─md1   9:1    0 11.2G  0 raid1 [SWAP]
└─sda3    8:3    0 62.4G  0 part  
 └─md2   9:2    0 62.4G  0 raid1 /
sdb       8:16   0 74.5G  0 disk  
├─sdb1    8:17   0  953M  0 part  
│ └─md0   9:0    0  952M  0 raid1 /boot
├─sdb2    8:18   0 11.2G  0 part  
│ └─md1   9:1    0 11.2G  0 raid1 [SWAP]
└─sdb3    8:19   0 62.4G  0 part  
 └─md2   9:2    0 62.4G  0 raid1 /

cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid1 sdb1[0] sda1[2]
     974848 blocks super 1.2 [2/2] [UU]

md2 : active raid1 sdb3[0] sda3[2]
     65421312 blocks super 1.2 [2/2] [UU]

md1 : active (auto-read-only) raid1 sdb2[0] sda2[1]
     11709440 blocks super 1.2 [2/2] [UU]

unused devices: <none>

mdadm --detail /dev/md*
mdadm: /dev/md does not appear to be an md device
/dev/md0:
          Version : 1.2
    Creation Time : Sat May  9 22:34:20 2020
       Raid Level : raid1
       Array Size : 974848 (952.00 MiB 998.24 MB)
    Used Dev Size : 974848 (952.00 MiB 998.24 MB)
     Raid Devices : 2
    Total Devices : 2
      Persistence : Superblock is persistent

      Update Time : Fri May 22 21:28:57 2020
            State : clean 
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0

Consistency Policy : resync

             Name : trekto:0  (local to host trekto)
             UUID : 1fb0b10f:68dd1abe:07ace5bf:ce797ed8
           Events : 281

   Number   Major   Minor   RaidDevice State
      0       8       17        0      active sync   /dev/sdb1
      2       8        1        1      active sync   /dev/sda1
/dev/md1:
          Version : 1.2
    Creation Time : Sat May  9 22:34:39 2020
       Raid Level : raid1
       Array Size : 11709440 (11.17 GiB 11.99 GB)
    Used Dev Size : 11709440 (11.17 GiB 11.99 GB)
     Raid Devices : 2
    Total Devices : 2
      Persistence : Superblock is persistent

      Update Time : Sat May  9 23:33:57 2020
            State : clean 
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0

Consistency Policy : resync

             Name : trekto:1  (local to host trekto)
             UUID : cbdd415f:20b34ad6:1fe7991d:cb2c78e1
           Events : 34

   Number   Major   Minor   RaidDevice State
      0       8       18        0      active sync   /dev/sdb2
      1       8        2        1      active sync   /dev/sda2
/dev/md2:
          Version : 1.2
    Creation Time : Sat May  9 22:34:47 2020
       Raid Level : raid1
       Array Size : 65421312 (62.39 GiB 66.99 GB)
    Used Dev Size : 65421312 (62.39 GiB 66.99 GB)
     Raid Devices : 2
    Total Devices : 2
      Persistence : Superblock is persistent

      Update Time : Fri May 22 21:46:07 2020
            State : clean 
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0

Consistency Policy : resync

             Name : trekto:2  (local to host trekto)
             UUID : d8bda655:d94cf675:5af758eb:f6d3a91b
           Events : 3199

   Number   Major   Minor   RaidDevice State
      0       8       19        0      active sync   /dev/sdb3
      2       8        3        1      active sync   /dev/sda3

是的，mdadm 正在執行並顯示健康狀況良好。

可能不起作用的是監視發送失敗通知的執行狀況的守護程序。

引用自：https://serverfault.com/questions/1018273