A fault in my OMV NAS with 2 x RAID 6 file systems caused one file system to be missing. Replacing the HBA and installing 5.5.11-1 does not recover the missing file system.
The outputs below show that the RAID should exist and would appreciate guidance as to how to progress from here to recover it and mount it
The 6 drives (sda to sdf) are present as raid members per the following
sudo blkid
/dev/sdg1: UUID="ebf605c7-8097-42be-8ceb-25d8d4108324" TYPE="ext4" PARTUUID="3c16e0a9-01"
/dev/sdg5: UUID="980c955e-7a33-403b-83ff-e00cb853a637" TYPE="swap" PARTUUID="3c16e0a9-05"
/dev/sdb: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="701a016a-0adf-8e41-df8e-2c697e035299" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
/dev/sdd: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="ebfb2860-5018-8314-56bb-becfbc323cbf" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
/dev/sde: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="5a652965-c823-284c-6a17-2b0611f927a8" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
/dev/sda: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="e9a610a9-7be9-4f82-0273-9527f3da4876" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
/dev/sdc: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="ce93d5d3-5dfc-a03f-583f-8f3429c8b676" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
/dev/sdf: UUID="89becd69-b5a4-761c-30e7-7a30c3b6a22f" UUID_SUB="bd7b4a88-2e2c-3e4f-90e3-bae51d5392c4" LABEL="OMV136.local:OMV136R629" TYPE="linux_raid_member"
The array appears to exist per the following
sudo mdadm --examine --scan
ARRAY /dev/md/OMV136R629 metadata=1.2 UUID=89becd69:b5a4761c:30e77a30:c3b6a22f name=OMV136.local:OMV136R629
Attempting to reassemble the array provides the following
sudo mdadm --assemble --scan -v
mdadm: looking for devices for further assembly
mdadm: cannot open device /dev/sr0: No medium found
mdadm: /dev/sdf is busy - skipping
mdadm: /dev/sdc is busy - skipping
mdadm: /dev/sda is busy - skipping
mdadm: /dev/sde is busy - skipping
mdadm: /dev/sdd is busy - skipping
mdadm: /dev/sdb is busy - skipping
mdadm: no recogniseable superblock on /dev/sdg5
mdadm: Cannot assemble mbr metadata on /dev/sdg2
mdadm: no recogniseable superblock on /dev/sdg1
mdadm: Cannot assemble mbr metadata on /dev/sdg
mdadm: No arrays found in config file or automatically
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Examination of each drive provides the following. Each device contains the information for the Raid Level and the number of Devices.
But the array state information shows AAAAAA for sda, .AAAAA for sdc, .A.AAA for sdb, sdd, sde, and sdf, and I do not know what the missing flag (dot) means
sudo mdadm --examine /dev/sd* -v
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : clean
Device UUID : 701a016a:0adf8e41:df8e2c69:7e035299
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:22:17 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : f767049b - correct
Events : 15598
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : .A.AAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : active
Device UUID : e9a610a9:7be94f82:02739527:f3da4876
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:20:19 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : 1295568e - correct
Events : 15568
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : active
Device UUID : ce93d5d3:5dfca03f:583f8f34:29c8b676
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:21:29 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : 8141029 - correct
Events : 15569
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : .AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : clean
Device UUID : ebfb2860:50188314:56bbbecf:bc323cbf
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:22:17 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : 4cff7b14 - correct
Events : 15598
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : .A.AAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : clean
Device UUID : 5a652965:c823284c:6a172b06:11f927a8
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:22:17 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : a8fd1264 - correct
Events : 15598
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : .A.AAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdf:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 89becd69:b5a4761c:30e77a30:c3b6a22f
Name : OMV136.local:OMV136R629
Creation Time : Fri Jun 26 15:13:28 2020
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 15627788976 (7451.91 GiB 8001.43 GB)
Array Size : 31255576576 (29807.64 GiB 32005.71 GB)
Used Dev Size : 15627788288 (7451.91 GiB 8001.43 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=688 sectors
State : active
Device UUID : bd7b4a88:2e2c3e4f:90e3bae5:1d5392c4
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Aug 22 08:21:37 2021
Bad Block Log : 512 entries available at offset 40 sectors
Checksum : cb2e571f - correct
Events : 15572
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 5
Array State : .A.AAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdg:
MBR Magic : aa55
Partition[0] : 591663104 sectors at 2048 (type 83)
Partition[1] : 33474562 sectors at 591667198 (type 05)
mdadm: No md superblock detected on /dev/sdg1.
/dev/sdg2:
MBR Magic : aa55
Partition[0] : 33474560 sectors at 2 (type 82)
mdadm: No md superblock detected on /dev/sdg5.
mdadm: cannot open /dev/sdh: No medium found
mdadm: cannot open /dev/sdi: No medium found
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Help would be much appreciated.