Hi,
I have the following problem on my RAID1 consisting of two 1GB-partitions (one 1TB drive /dev/sda1, one 1TB partition on a 4TB drive /dev/sdb1). After OMV-reboot, the second drive is always missing from the array and it is showing as clean & degraded. Funny enough, the other partition (NTFS, standalone) on the same drive as the missing RAID partition is showing up. Host platform is RPi2 on OMV 3.0.99. Below are the commandline dumps. And help is highly appreciated. And yes, I know that RPi is not an optimal platform for a NAS let alone RAID.
Code
root@nas:~# blkid
/dev/mmcblk0p1: LABEL="boot" UUID="CE83-8CE1" TYPE="vfat" PARTUUID="c5ac05a5-01"
/dev/mmcblk0p2: UUID="ae708a4d-982a-4a20-965c-01ec7e1f32b3" TYPE="ext4" PARTUUID="c5ac05a5-02"
/dev/sda1: UUID="5b3b0034-9473-e7bd-87c4-2266c2ca9b27" UUID_SUB="25962000-1a86-4b86-a4c0-8f7f3d2b730d" LABEL="nas:0" TYPE="linux_raid_member" PARTUUID="31237eaa-01"
/dev/sdb1: UUID="5b3b0034-9473-e7bd-87c4-2266c2ca9b27" UUID_SUB="5473fa23-1682-d8af-58e7-1c83b52d6c5d" LABEL="nas:0" TYPE="linux_raid_member" PARTLABEL="Basic data partition" PARTUUID="4fd144f5-040f-4396-a2b6-303172206f4c"
/dev/sdb2: LABEL="Public" UUID="3C368F8B368F44BC" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="8badc06e-229f-4fd2-9456-0a798fa8e8a8"
/dev/md0: LABEL="Home" UUID="2e0ec333-8b75-450b-8203-de562df31360" TYPE="ext4"
/dev/zram0: UUID="586078ee-2ff9-4b9b-9fee-bc00669bf951" TYPE="swap"
/dev/zram1: UUID="a7101a2a-4b79-4ede-9c36-1d40076054f1" TYPE="swap"
/dev/zram2: UUID="9d0440e1-9c13-4365-9ea2-d8bdeefe0cf3" TYPE="swap"
/dev/zram3: UUID="b3193141-5910-4622-96bf-a03d75617e1f" TYPE="swap"
/dev/mmcblk0: PTUUID="c5ac05a5" PTTYPE="dos"
root@nas:~#
root@nas:~# fdisk -l | grep "Disk "
Disk /dev/ram0: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram1: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram2: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram3: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram4: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram5: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram6: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram7: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram8: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram9: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram10: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram11: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram12: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram13: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram14: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/ram15: 4 MiB, 4194304 bytes, 8192 sectors
Disk /dev/mmcblk0: 7.4 GiB, 7969177600 bytes, 15564800 sectors
Disk identifier: 0xc5ac05a5
Disk /dev/sda: 931.5 GiB, 1000204883968 bytes, 1953525164 sectors
Disk identifier: 0x31237eaa
Disk /dev/sdb: 3.7 TiB, 4000787029504 bytes, 7814037167 sectors
Disk identifier: 4643D037-5C3C-4841-9122-6F75D56264CC
Disk /dev/md0: 931.4 GiB, 1000068415488 bytes, 1953258624 sectors
Disk /dev/zram0: 122.1 MiB, 128040960 bytes, 31260 sectors
Disk /dev/zram1: 122.1 MiB, 128040960 bytes, 31260 sectors
Disk /dev/zram2: 122.1 MiB, 128040960 bytes, 31260 sectors
Disk /dev/zram3: 122.1 MiB, 128040960 bytes, 31260 sectors
root@nas:~#
root@nas:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
# Note, if no DEVICE line is present, then "DEVICE partitions" is assumed.
# To avoid the auto-assembly of RAID devices a pattern that CAN'T match is
# used if no RAID devices are configured.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# definitions of existing MD arrays
ARRAY /dev/md/0 metadata=1.2 name=nas:0 UUID=5b3b0034:9473e7bd:87c42266:c2ca9b27
root@nas:~#
root@nas:~# mdadm --detail --scan --verbose
ARRAY /dev/md/0 level=raid1 num-devices=2 metadata=1.2 name=nas:0 UUID=5b3b0034:9473e7bd:87c42266:c2ca9b27
devices=/dev/sdb1
root@nas:~#