Here are the particulars of my OMV setup and the diagnostics that I'm getting.
Many thanks for any help that can be offered!
QTY 2 USB HDDs, RAID1 Array (Mirror) 1 Tb each, common general storage
QTY 1 USB HDD, 750 Gb, Time Machine
Issue appeared after HW mods to the PC.
I failed to make sure that the HDDs all ended up plugged into the same USB ports as before. Other posts seem to imply this can create issues.
{from WebGUI}
Version : 1.2
Creation Time : Fri Feb 24 11:19:46 2017
Raid Level : raid1
Array Size : 976631360 (931.39 GiB 1000.07 GB)
Used Dev Size : 976631360 (931.39 GiB 1000.07 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Wed Apr5 22:43:00 2017
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : OMV:Common(local to host OMV)
UUID : ff53692d:672cca20:978659ba:501268d3
Events : 41
NumberMajorMinorRaidDevice State
0000removed
18321active sync/dev/sdc
{from WebGUI}
Version : 1.2
Creation Time : Fri Feb 24 11:19:46 2017
Raid Level : raid1
Array Size : 976631360 (931.39 GiB 1000.07 GB)
Used Dev Size : 976631360 (931.39 GiB 1000.07 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Tue Apr 18 23:05:29 2017
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : OMV:Common(local to host OMV)
UUID : ff53692d:672cca20:978659ba:501268d3
Events : 2543
NumberMajorMinorRaidDevice State
08160active sync/dev/sdb
1001removed
root@OMV:~# fdisk -l|grep "Disk "
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sdc doesn't contain a valid partition table
WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'!The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/md127 doesn't contain a valid partition table
Disk /dev/md126 doesn't contain a valid partition table
Disk /dev/sda: 500.1 GB, 500107862016 bytes
Disk identifier: 0x0001f3e7
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
Disk identifier: 0x00000000
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
Disk identifier: 0x00000000
Disk /dev/sdd: 640.1 GB, 640135028736 bytes
Disk identifier: 0x00000000
Disk /dev/md127: 1000.1 GB, 1000070512640 bytes
Disk identifier: 0x00000000
Disk /dev/md126: 1000.1 GB, 1000070512640 bytes
Disk identifier: 0x00000000
root@OMV:~# cat /proc/mdstat
Personalities : [raid1]
md126 : active (auto-read-only) raid1 sdc[1]
976631360 blocks super 1.2 [2/1] [_U]
md127 : active raid1 sdb[0]
976631360 blocks super 1.2 [2/1] [U_]
root@OMV:~# blkid
/dev/sda1: UUID="27560d37-1642-45ae-a731-3c05bf518372" TYPE="ext4"
/dev/sda5: UUID="09251f9c-7bf2-4f49-bfc2-caaad53010a1" TYPE="swap"
/dev/sdc: UUID="ff53692d-672c-ca20-9786-59ba501268d3" UUID_SUB="bf1ea5b4-8edb-3b08-77e1-efe811d5c82d" LABEL="OMV:Common" TYPE="linux_raid_member"
/dev/md127: LABEL="Common" UUID="eda22d5a-85cc-4964-bb53-99e8ae6fe6d0" TYPE="ext4"
/dev/md126: LABEL="Common" UUID="eda22d5a-85cc-4964-bb53-99e8ae6fe6d0" TYPE="ext4"
/dev/sdb: UUID="ff53692d-672c-ca20-9786-59ba501268d3" UUID_SUB="177e50aa-31ae-883d-5d7a-7aaffeee2df2" LABEL="OMV:Common" TYPE="linux_raid_member"
/dev/sdd1: LABEL="EFI" UUID="67E3-17ED" TYPE="vfat"
/dev/sdd2: UUID="302fb51d-708a-3261-ad5a-a532bc742f0e" LABEL="TimeMachine" TYPE="hfsplus"
root@OMV:~# blkid
/dev/sda1: UUID="27560d37-1642-45ae-a731-3c05bf518372" TYPE="ext4"
/dev/sda5: UUID="09251f9c-7bf2-4f49-bfc2-caaad53010a1" TYPE="swap"
/dev/sdc: UUID="ff53692d-672c-ca20-9786-59ba501268d3" UUID_SUB="bf1ea5b4-8edb-3b08-77e1-efe811d5c82d" LABEL="OMV:Common" TYPE="linux_raid_member"
/dev/md127: LABEL="Common" UUID="eda22d5a-85cc-4964-bb53-99e8ae6fe6d0" TYPE="ext4"
/dev/md126: LABEL="Common" UUID="eda22d5a-85cc-4964-bb53-99e8ae6fe6d0" TYPE="ext4"
/dev/sdb: UUID="ff53692d-672c-ca20-9786-59ba501268d3" UUID_SUB="177e50aa-31ae-883d-5d7a-7aaffeee2df2" LABEL="OMV:Common" TYPE="linux_raid_member"
/dev/sdd1: LABEL="EFI" UUID="67E3-17ED" TYPE="vfat"
/dev/sdd2: UUID="302fb51d-708a-3261-ad5a-a532bc742f0e" LABEL="TimeMachine" TYPE="hfsplus"
root@OMV:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about thisfile.
#
# by default (built-in), scan all partitions(/proc/partitions) and all
# containers for MD superblocks. alternatively, specifydevices to scan, using
# wildcards if desired.
#DEVICE partitions containers
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the localsystem
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# definitions of existing MD arrays
# This file was auto-generated on Mon, 29 Jun 2015 07:23:18+0000
# by mkconf 3.2.5-5