staging.inyokaproject.org

# mdadm -D /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Tue Oct 27 17:40:14 2020
        Raid Level : raid1
        Array Size : 15006656 (14.31 GiB 15.37 GB)
     Used Dev Size : 15006656 (14.31 GiB 15.37 GB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

       Update Time : Mon Nov  2 14:08:48 2020
             State : clean
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

              Name : pihole:0  (local to host pihole)
              UUID : 72633857:005a0f94:c995caec:b8d0a777
            Events : 19

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1

# cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb1[1] sda1[0]
      15006656 blocks super 1.2 [2/2] [UU]

unused devices: <none>

# lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda           8:0    1 14.3G  0 disk
└─sda1        8:1    1 14.3G  0 part
  └─md0       9:0    0 14.3G  0 raid1
sdb           8:16   1 14.3G  0 disk
└─sdb1        8:17   1 14.3G  0 part
  └─md0       9:0    0 14.3G  0 raid1
mmcblk0     179:0    0  7.5G  0 disk
├─mmcblk0p1 179:1    0  256M  0 part  /boot/firmware
└─mmcblk0p2 179:2    0  7.3G  0 part  /

# mdadm -E /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 72633857:005a0f94:c995caec:b8d0a777
           Name : pihole:0  (local to host pihole)
  Creation Time : Tue Oct 27 17:40:14 2020
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 30013343 (14.31 GiB 15.37 GB)
     Array Size : 15006656 (14.31 GiB 15.37 GB)
  Used Dev Size : 30013312 (14.31 GiB 15.37 GB)
    Data Offset : 18432 sectors
   Super Offset : 8 sectors
   Unused Space : before=18280 sectors, after=31 sectors
          State : clean
    Device UUID : 62284726:331d73c5:d26d4bdc:ec414b66

    Update Time : Mon Nov  2 14:08:48 2020
  Bad Block Log : 512 entries available at offset 136 sectors
       Checksum : 89aeddd8 - correct
         Events : 19


   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

# mdadm -E /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 72633857:005a0f94:c995caec:b8d0a777
           Name : pihole:0  (local to host pihole)
  Creation Time : Tue Oct 27 17:40:14 2020
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 30013343 (14.31 GiB 15.37 GB)
     Array Size : 15006656 (14.31 GiB 15.37 GB)
  Used Dev Size : 30013312 (14.31 GiB 15.37 GB)
    Data Offset : 18432 sectors
   Super Offset : 8 sectors
   Unused Space : before=18280 sectors, after=31 sectors
          State : clean
    Device UUID : 9ece0df8:0388ad2f:916bf569:691c1cd7

    Update Time : Mon Nov  2 14:08:48 2020
  Bad Block Log : 512 entries available at offset 136 sectors
       Checksum : c42ac721 - correct
         Events : 19


   Device Role : Active device 1
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

# cat /etc/mdadm/mdadm.conf
HOMEHOST <ignore>
MAILADDR bla@blablabla.de
ARRAY /dev/md0 metadata=1.2 name=pihole:0 UUID=72633857:005a0f94:c995caec:b8d0a777

# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            1.9G     0  1.9G   0% /dev
tmpfs           380M  3.7M  376M   1% /run
/dev/mmcblk0p2  7.1G  5.1G  1.8G  75% /
tmpfs           1.9G  2.6M  1.9G   1% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/mmcblk0p1  253M  126M  127M  50% /boot/firmware
tmpfs           380M     0  380M   0% /run/user/997
tmpfs           380M     0  380M   0% /run/user/0

# cat /etc/fstab
LABEL=writable          /               ext4    defaults                        0       0
LABEL=system-boot       /boot/firmware  vfat    defaults                        0       1
UUID=72633857:005a0f94:c995caec:b8d0a777   /media/raid   ext4   auto,nofail,sync,users,rw   0   0