Yeah it's odd. I believe that ages ago I had an array on the full
disks (not partitions). I've since switched to RAID based on
partitions (this array that works in Ubuntu but not Arch). Maybe that
is where the confusion comes from.
I just realized I provided the examine data for the old unused array
within Arch, and you're right, sda1 and sdb1 don't exist under Arch:
$ sudo partprobe --summary
/dev/sda: msdos partitions 1
/dev/sdb: msdos partitions 1
/dev/sdc: msdos partitions 1 2
/dev/sdd: msdos partitions 1 2
/dev/sde: msdos partitions 1 2
/dev/sdf: msdos partitions 1 2 3
$ sudo fdisk -l /dev/sda
Disk /dev/sda: 1.8 TiB, 1998998994944 bytes, 3904294912 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x056cc1c0
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 3904294911 3904292864 1.8T fd Linux raid autodetect
$ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 1.8 TiB, 1998998994944 bytes, 3904294912 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x9fb14a5c
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 3904294911 3904292864 1.8T fd Linux raid autodetect
$ ls -la /dev/sda*
brw-rw---- 1 root disk 8, 0 Sep 24 20:14 /dev/sda
$ ls -la /dev/sdb*
brw-rw---- 1 root disk 8, 16 Sep 24 20:14 /dev/sdb
So for some reason the kernel does not see the partitions even though
partprobe and fdisk show them.
Regards,
Mathias
On 24 September 2015 at 10:17, Alexander Afonyashin
<a.afonyashin@xxxxxxxxxxxxxx> wrote:
> Hi Matias,
>
> I wonder why Ubuntu detects raid6 parts as /dev/sdX1 (and counts only
> 5 disks) while Arch detects /dev/sdX (and counts 6 disks)? Try to
> assemble raid6 on Arch manually again by issuing:
>
> mdadm -S /dev/md0
> mdadm -A /dev/md0 /dev/sdb /dev/sda /dev/sde /dev/sdd /dev/sdc -
> exactly as shown in mdadm's output on Ubuntu
>
> P.S. Still confused why Arch doesn't recognize /dev/sda1 etc.
>
> Regards,
> Alexander
>
> On Wed, Sep 23, 2015 at 9:35 PM, Mathias Burén <mathias.buren@xxxxxxxxx> wrote:
>> Hi Alexander,
>>
>> I didn't try to grow the array or anything, just swapped out the OS.
>> When I boot back into Ubuntu it assembles fine.
>>
>> This is from within Ubuntu (I did a mdadm --assemble --scan using
>> mdadm - v3.3.2-7-g21dc471 - 03th November 2014)
>>
>> mdadm -D on RAID6
>> /dev/md0:
>> Version : 1.2
>> Creation Time : Thu Nov 20 23:52:58 2014
>> Raid Level : raid6
>> Array Size : 5856046080 (5584.76 GiB 5996.59 GB)
>> Used Dev Size : 1952015360 (1861.59 GiB 1998.86 GB)
>> Raid Devices : 5
>> Total Devices : 5
>> Persistence : Superblock is persistent
>>
>> Intent Bitmap : Internal
>>
>> Update Time : Sun Sep 20 19:47:50 2015
>> State : clean
>> Active Devices : 5
>> Working Devices : 5
>> Failed Devices : 0
>> Spare Devices : 0
>>
>> Layout : left-symmetric
>> Chunk Size : 512K
>>
>> Name : ion:0 (local to host ion)
>> UUID : 4cae433f:a40afcf5:f9aba91d:d8217b69
>> Events : 59736
>>
>> Number Major Minor RaidDevice State
>> 0 8 17 0 active sync /dev/sdb1
>> 1 8 33 1 active sync /dev/sdc1
>> 2 8 49 2 active sync /dev/sdd1
>> 3 8 65 3 active sync /dev/sde1
>> 4 8 1 4 active sync /dev/sda1
>>
>>
>> mdadm -D on RAID0
>> /dev/md1:
>> Version : 1.2
>> Creation Time : Thu Nov 20 23:53:48 2014
>> Raid Level : raid0
>> Array Size : 4098048 (3.91 GiB 4.20 GB)
>> Raid Devices : 3
>> Total Devices : 3
>> Persistence : Superblock is persistent
>>
>> Update Time : Thu Nov 20 23:53:48 2014
>> State : clean
>> Active Devices : 3
>> Working Devices : 3
>> Failed Devices : 0
>> Spare Devices : 0
>>
>> Chunk Size : 512K
>>
>> Name : ion:1 (local to host ion)
>> UUID : a20b70d4:7ee17e3f:abab74f8:dadb8cd8
>> Events : 0
>>
>> Number Major Minor RaidDevice State
>> 0 8 34 0 active sync /dev/sdc2
>> 1 8 50 1 active sync /dev/sdd2
>> 2 8 66 2 active sync /dev/sde2
>>
>>
>>
>> lsdrv from within Ubuntu
>> PCI [megaraid_sas] 02:0e.0 RAID bus controller: LSI Logic / Symbios
>> Logic MegaRAID SAS 1068
>> ├scsi 0:2:0:0 LSI MegaRAID 84016E {00ede206d4a731011c50ff5e02b00506}
>> │└sda 1.82t [8:0] MD raid6 (6) inactive 'ion:md0'
>> {0ad2603e-e432-83ee-0218-077398e716ef}
>> │ └sda1 1.82t [8:1] MD raid6 (4/5) (w/ sdb1,sdc1,sdd1,sde1) in_sync
>> 'ion:0' {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>> │ └md0 5.45t [9:0] MD v1.2 raid6 (5) clean, 512k Chunk
>> {4cae433f:a40afcf5:f9aba91d:d8217b69}
>> │ ext4 '6TB_RAID6' {9e3c1fbe-8228-4b38-9047-66a5e2429e5f}
>> └scsi 0:2:1:0 LSI MegaRAID 84016E {0036936cc4270000ff50ff5e02b00506}
>> └sdb 1.82t [8:16] MD raid6 (6) inactive 'ion:md0'
>> {0ad2603e-e432-83ee-0218-077398e716ef}
>> └sdb1 1.82t [8:17] MD raid6 (0/5) (w/ sda1,sdc1,sdd1,sde1) in_sync
>> 'ion:0' {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>> └md0 5.45t [9:0] MD v1.2 raid6 (5) clean, 512k Chunk
>> {4cae433f:a40afcf5:f9aba91d:d8217b69}
>> ext4 '6TB_RAID6' {9e3c1fbe-8228-4b38-9047-66a5e2429e5f}
>> PCI [ahci] 00:1f.2 SATA controller: Intel Corporation 8 Series/C220
>> Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
>> ├scsi 1:0:0:0 ATA Corsair CSSD-F60 {10326505580009990027}
>> │└sdf 55.90g [8:80] Partitioned (dos)
>> │ ├sdf1 243.00m [8:81] ext2 {b45c13c8-4246-43ee-ac2c-f9bb5de099f8}
>> │ │└Mounted as /dev/sdf1 @ /boot
>> │ ├sdf2 1.00k [8:82] Partitioned (dos)
>> │ └sdf5 55.66g [8:85] PV LVM2_member 55.66g used, 0 free
>> {zZ5Dgy-E7v8-Y1Mi-EuqG-uXUb-DseW-s7goxG}
>> │ └VG ion 55.66g 0 free {XSaCyP-phLN-m4IH-2cJ7-1XXw-b3uh-qWBl8N}
>> │ ├dm-0 52.41g [252:0] LV root ext4 {63342e0d-1b4f-4475-9835-d3a2a6610e8f}
>> │ │└Mounted as /dev/mapper/ion-root @ /
>> │ └dm-1 3.25g [252:1] LV swap_1 Empty/Unknown
>> │ └dm-2 3.25g [252:2] swap {0c81625d-ee9e-4a7a-9613-410c1cf53e72}
>> ├scsi 2:0:0:0 ATA SAMSUNG HD204UI {S2H7JR0B501861}
>> │└sdc 1.82t [8:32] MD raid6 (6) inactive 'ion:md0'
>> {0ad2603e-e432-83ee-0218-077398e716ef}
>> │ ├sdc1 1.82t [8:33] MD raid6 (1/5) (w/ sda1,sdb1,sdd1,sde1) in_sync
>> 'ion:0' {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>> │ │└md0 5.45t [9:0] MD v1.2 raid6 (5) clean, 512k Chunk
>> {4cae433f:a40afcf5:f9aba91d:d8217b69}
>> │ │ ext4 '6TB_RAID6' {9e3c1fbe-8228-4b38-9047-66a5e2429e5f}
>> │ └sdc2 1.30g [8:34] MD raid0 (0/3) (w/ sdd2,sde2) in_sync 'ion:1'
>> {a20b70d4-7ee1-7e3f-abab-74f8dadb8cd8}
>> │ └md1 3.91g [9:1] MD v1.2 raid0 (3) clean, 512k Chunk, None (None)
>> None {a20b70d4:7ee17e3f:abab74f8:dadb8cd8}
>> │ ext4 '4GB_RAID0' {c8327dd0-9d3f-4457-a73a-c9c7d5a0ee3f}
>> ├scsi 3:x:x:x [Empty]
>> ├scsi 4:x:x:x [Empty]
>> ├scsi 5:0:0:0 ATA WDC WD20EARS-00J {WD-WCAWZ2036074}
>> │└sdd 1.82t [8:48] MD raid6 (6) inactive 'ion:md0'
>> {0ad2603e-e432-83ee-0218-077398e716ef}
>> │ ├sdd1 1.82t [8:49] MD raid6 (2/5) (w/ sda1,sdb1,sdc1,sde1) in_sync
>> 'ion:0' {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>> │ │└md0 5.45t [9:0] MD v1.2 raid6 (5) clean, 512k Chunk
>> {4cae433f:a40afcf5:f9aba91d:d8217b69}
>> │ │ ext4 '6TB_RAID6' {9e3c1fbe-8228-4b38-9047-66a5e2429e5f}
>> │ └sdd2 1.30g [8:50] MD raid0 (1/3) (w/ sdc2,sde2) in_sync 'ion:1'
>> {a20b70d4-7ee1-7e3f-abab-74f8dadb8cd8}
>> │ └md1 3.91g [9:1] MD v1.2 raid0 (3) clean, 512k Chunk, None (None)
>> None {a20b70d4:7ee17e3f:abab74f8:dadb8cd8}
>> │ ext4 '4GB_RAID0' {c8327dd0-9d3f-4457-a73a-c9c7d5a0ee3f}
>> └scsi 6:0:0:0 ATA ST3000DM001-1CH1 {W1F2PZGH}
>> └sde 2.73t [8:64] Partitioned (dos)
>> ├sde1 1.82t [8:65] MD raid6 (3/5) (w/ sda1,sdb1,sdc1,sdd1) in_sync
>> 'ion:0' {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>> │└md0 5.45t [9:0] MD v1.2 raid6 (5) clean, 512k Chunk
>> {4cae433f:a40afcf5:f9aba91d:d8217b69}
>> │ ext4 '6TB_RAID6' {9e3c1fbe-8228-4b38-9047-66a5e2429e5f}
>> ├sde2 1.30g [8:66] MD raid0 (2/3) (w/ sdc2,sdd2) in_sync 'ion:1'
>> {a20b70d4-7ee1-7e3f-abab-74f8dadb8cd8}
>> │└md1 3.91g [9:1] MD v1.2 raid0 (3) clean, 512k Chunk, None (None)
>> None {a20b70d4:7ee17e3f:abab74f8:dadb8cd8}
>> │ ext4 '4GB_RAID0' {c8327dd0-9d3f-4457-a73a-c9c7d5a0ee3f}
>> └sde3 184.98g [8:67] ext4 '198GB' {e4fc427a-4ec1-48dc-8d9b-bfcffe06d42f}
>> └Mounted as /dev/sde3 @ /media/198GB
>> Other Block Devices
>> ├loop0 0.00k [7:0] Empty/Unknown
>> ├loop1 0.00k [7:1] Empty/Unknown
>> ├loop2 0.00k [7:2] Empty/Unknown
>> ├loop3 0.00k [7:3] Empty/Unknown
>> ├loop4 0.00k [7:4] Empty/Unknown
>> ├loop5 0.00k [7:5] Empty/Unknown
>> ├loop6 0.00k [7:6] Empty/Unknown
>> ├loop7 0.00k [7:7] Empty/Unknown
>> ├md127 0.00k [9:127] MD vnone () clear, None (None) None {None}
>> │ Empty/Unknown
>> ├ram0 64.00m [1:0] Empty/Unknown
>> ├ram1 64.00m [1:1] Empty/Unknown
>> ├ram2 64.00m [1:2] Empty/Unknown
>> ├ram3 64.00m [1:3] Empty/Unknown
>> ├ram4 64.00m [1:4] Empty/Unknown
>> ├ram5 64.00m [1:5] Empty/Unknown
>> ├ram6 64.00m [1:6] Empty/Unknown
>> ├ram7 64.00m [1:7] Empty/Unknown
>> ├ram8 64.00m [1:8] Empty/Unknown
>> ├ram9 64.00m [1:9] Empty/Unknown
>> ├ram10 64.00m [1:10] Empty/Unknown
>> ├ram11 64.00m [1:11] Empty/Unknown
>> ├ram12 64.00m [1:12] Empty/Unknown
>> ├ram13 64.00m [1:13] Empty/Unknown
>> ├ram14 64.00m [1:14] Empty/Unknown
>> └ram15 64.00m [1:15] Empty/Unknown
>>
>>
>> /proc/mdstat on Ubuntu
>> Personalities : [raid6] [raid5] [raid4] [raid0]
>> md0 : active raid6 sdb1[0] sda1[4] sde1[3] sdd1[2] sdc1[1]
>> 5856046080 blocks super 1.2 level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
>> bitmap: 0/15 pages [0KB], 65536KB chunk
>>
>> md1 : active raid0 sdc2[0] sde2[2] sdd2[1]
>> 4098048 blocks super 1.2 512k chunks
>>
>> Regards,
>> Mathias
>>
>> On 23 September 2015 at 07:24, Alexander Afonyashin
>> <a.afonyashin@xxxxxxxxxxxxxx> wrote:
>>> Hi,
>>>
>>> I wonder why metainfo from /dev/sdf1 thinks that there're only 5
>>> devices in raid6. Did you try to grow your array recently?
>>> Show the output of mdadm -D /dev/mdX when array is assembled on Ubuntu.
>>> Can you assemble the array with 4 disks: /dev/sd[a-d]?
>>>
>>> P.S. According to mdadm output metainfo on /dev/sdf1 claims that it's
>>> from another md-array (check Array UUID field). You may need to zero
>>> metadata on /dev/sdf1 and re-add in to existing raid6 array.
>>>
>>> Regards,
>>> Alexander
>>>
>>> On Wed, Sep 23, 2015 at 12:30 AM, Mathias Burén <mathias.buren@xxxxxxxxx> wrote:
>>>> Hi (please reply-all)
>>>>
>>>> I've a RAID6 array (sda sdb sdd sde sdf1) that I can't assemble under
>>>> Arch, but it worked fine under Ubuntu. mdadm - v3.3.4 - 3rd August
>>>> 2015, kernel 4.1.6
>>>>
>>>> Here is the mdadm --examine for each drive:
>>>>
>>>>
>>>>
>>>> [root@ion ~]# mdadm --examine /dev/sda
>>>> /dev/sda:
>>>> Magic : a92b4efc
>>>> Version : 1.2
>>>> Feature Map : 0x0
>>>> Array UUID : 0ad2603e:e43283ee:02180773:98e716ef
>>>> Name : ion:md0 (local to host ion)
>>>> Creation Time : Tue Feb 5 17:33:27 2013
>>>> Raid Level : raid6
>>>> Raid Devices : 6
>>>>
>>>> Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
>>>> Array Size : 7813531648 (7451.56 GiB 8001.06 GB)
>>>> Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
>>>> Data Offset : 262144 sectors
>>>> Super Offset : 8 sectors
>>>> Unused Space : before=262064 sectors, after=18446744073706818560 sectors
>>>> State : clean
>>>> Device UUID : a09fc60d:5c4a27a5:4b89bc33:29b01582
>>>>
>>>> Update Time : Tue Nov 4 21:43:49 2014
>>>> Checksum : 528563ee - correct
>>>> Events : 97557
>>>>
>>>> Layout : left-symmetric
>>>> Chunk Size : 512K
>>>>
>>>> Device Role : Active device 3
>>>> Array State : AA.AAA ('A' == active, '.' == missing, 'R' == replacing)
>>>>
>>>> [root@ion ~]# mdadm --examine /dev/sdb
>>>> /dev/sdb:
>>>> Magic : a92b4efc
>>>> Version : 1.2
>>>> Feature Map : 0x0
>>>> Array UUID : 0ad2603e:e43283ee:02180773:98e716ef
>>>> Name : ion:md0 (local to host ion)
>>>> Creation Time : Tue Feb 5 17:33:27 2013
>>>> Raid Level : raid6
>>>> Raid Devices : 6
>>>>
>>>> Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
>>>> Array Size : 7813531648 (7451.56 GiB 8001.06 GB)
>>>> Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
>>>> Data Offset : 262144 sectors
>>>> Super Offset : 8 sectors
>>>> Unused Space : before=262064 sectors, after=18446744073706818560 sectors
>>>> State : clean
>>>> Device UUID : 93568b01:632395bf:7d0082a5:db9b6ff9
>>>>
>>>> Update Time : Tue Nov 4 21:43:49 2014
>>>> Checksum : 49d756ca - correct
>>>> Events : 97557
>>>>
>>>> Layout : left-symmetric
>>>> Chunk Size : 512K
>>>>
>>>> Device Role : Active device 0
>>>> Array State : AA.AAA ('A' == active, '.' == missing, 'R' == replacing)
>>>>
>>>>
>>>> [root@ion ~]# mdadm --examine /dev/sdd
>>>> /dev/sdd:
>>>> Magic : a92b4efc
>>>> Version : 1.2
>>>> Feature Map : 0x0
>>>> Array UUID : 0ad2603e:e43283ee:02180773:98e716ef
>>>> Name : ion:md0 (local to host ion)
>>>> Creation Time : Tue Feb 5 17:33:27 2013
>>>> Raid Level : raid6
>>>> Raid Devices : 6
>>>>
>>>> Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
>>>> Array Size : 7813531648 (7451.56 GiB 8001.06 GB)
>>>> Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
>>>> Data Offset : 262144 sectors
>>>> Super Offset : 8 sectors
>>>> Unused Space : before=262064 sectors, after=1200 sectors
>>>> State : clean
>>>> Device UUID : 78df2586:cb5649aa:e0b6d211:d92dc224
>>>>
>>>> Update Time : Tue Nov 4 21:43:49 2014
>>>> Checksum : 50c95b7c - correct
>>>> Events : 97557
>>>>
>>>> Layout : left-symmetric
>>>> Chunk Size : 512K
>>>>
>>>> Device Role : Active device 5
>>>> Array State : AA.AAA ('A' == active, '.' == missing, 'R' == replacing)
>>>>
>>>> [root@ion ~]# mdadm --examine /dev/sde
>>>> /dev/sde:
>>>> Magic : a92b4efc
>>>> Version : 1.2
>>>> Feature Map : 0x0
>>>> Array UUID : 0ad2603e:e43283ee:02180773:98e716ef
>>>> Name : ion:md0 (local to host ion)
>>>> Creation Time : Tue Feb 5 17:33:27 2013
>>>> Raid Level : raid6
>>>> Raid Devices : 6
>>>>
>>>> Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
>>>> Array Size : 7813531648 (7451.56 GiB 8001.06 GB)
>>>> Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
>>>> Data Offset : 262144 sectors
>>>> Super Offset : 8 sectors
>>>> Unused Space : before=262064 sectors, after=1200 sectors
>>>> State : clean
>>>> Device UUID : 41712f8c:255b0f3e:0e345f7b:e1504e42
>>>>
>>>> Update Time : Tue Nov 4 21:43:49 2014
>>>> Checksum : 71b191d6 - correct
>>>> Events : 97557
>>>>
>>>> Layout : left-symmetric
>>>> Chunk Size : 512K
>>>>
>>>> Device Role : Active device 1
>>>> Array State : AA.AAA ('A' == active, '.' == missing, 'R' == replacing)
>>>>
>>>> [root@ion ~]# mdadm --examine /dev/sdf1
>>>> /dev/sdf1:
>>>> Magic : a92b4efc
>>>> Version : 1.2
>>>> Feature Map : 0x1
>>>> Array UUID : 4cae433f:a40afcf5:f9aba91d:d8217b69
>>>> Name : ion:0 (local to host ion)
>>>> Creation Time : Thu Nov 20 23:52:58 2014
>>>> Raid Level : raid6
>>>> Raid Devices : 5
>>>>
>>>> Avail Dev Size : 3904030720 (1861.59 GiB 1998.86 GB)
>>>> Array Size : 5856046080 (5584.76 GiB 5996.59 GB)
>>>> Data Offset : 262144 sectors
>>>> Super Offset : 8 sectors
>>>> Unused Space : before=262056 sectors, after=0 sectors
>>>> State : clean
>>>> Device UUID : eaa0dcba:d04a7c16:6c256916:67a491ae
>>>>
>>>> Internal Bitmap : 8 sectors from superblock
>>>> Update Time : Sun Sep 20 19:47:50 2015
>>>> Bad Block Log : 512 entries available at offset 72 sectors
>>>> Checksum : b1f6f725 - correct
>>>> Events : 59736
>>>>
>>>> Layout : left-symmetric
>>>> Chunk Size : 512K
>>>>
>>>> Device Role : Active device 3
>>>> Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Here is ldrv:
>>>>
>>>> [root@ion ~]# python2 lsdrv
>>>> PCI [megaraid_sas] 02:0e.0 RAID bus controller: LSI Logic / Symbios
>>>> Logic MegaRAID SAS 1068
>>>> ├scsi 0:2:0:0 LSI MegaRAID 84016E {00ede206d4a731011c50ff5e02b00506}
>>>> │└sda 1.82t [8:0] MD raid6 (6) inactive 'ion:md0'
>>>> {0ad2603e-e432-83ee-0218-077398e716ef}
>>>> └scsi 0:2:1:0 LSI MegaRAID 84016E {0036936cc4270000ff50ff5e02b00506}
>>>> └sdb 1.82t [8:16] MD raid6 (6) inactive 'ion:md0'
>>>> {0ad2603e-e432-83ee-0218-077398e716ef}
>>>> PCI [ahci] 00:1f.2 SATA controller: Intel Corporation 8 Series/C220
>>>> Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
>>>> ├scsi 1:0:0:0 ATA INTEL SSDSA2BW16 {BTPR2062006T160DGN}
>>>> │└sdc 149.05g [8:32] Partitioned (dos)
>>>> │ ├sdc1 256.00m [8:33] ext4 'boot' {f7727d21-646d-42f9-844b-50591b7f8358}
>>>> │ │└Mounted as /dev/sdc1 @ /boot
>>>> │ └sdc2 140.00g [8:34] PV LVM2_member 40.00g used, 100.00g free
>>>> {KGQ5TJ-mVvL-1Ccd-CKae-1QvS-6AFn-8jFQAw}
>>>> │ └VG ArchVG 140.00g 100.00g free {F2vaKY-XO4m-UEih-f9Fh-sHgX-cRsN-SLi3Oo}
>>>> │ ├dm-1 32.00g [254:1] LV root ext4 'root'
>>>> {82fa2951-25c8-4e36-bf36-9f4f7747ac46}
>>>> │ │└Mounted as /dev/mapper/ArchVG-root @ /
>>>> │ └dm-0 8.00g [254:0] LV swap swap {0e3f4596-fa50-4fed-875f-f8427084d9b5}
>>>> ├scsi 2:0:0:0 ATA SAMSUNG HD204UI {S2H7JR0B501861}
>>>> │└sdd 1.82t [8:48] MD raid6 (6) inactive 'ion:md0'
>>>> {0ad2603e-e432-83ee-0218-077398e716ef}
>>>> ├scsi 3:x:x:x [Empty]
>>>> ├scsi 4:x:x:x [Empty]
>>>> ├scsi 5:0:0:0 ATA WDC WD20EARS-00J {WD-WCAWZ2036074}
>>>> │└sde 1.82t [8:64] MD raid6 (6) inactive 'ion:md0'
>>>> {0ad2603e-e432-83ee-0218-077398e716ef}
>>>> └scsi 6:0:0:0 ATA ST3000DM001-1CH1 {W1F2PZGH}
>>>> └sdf 2.73t [8:80] Partitioned (dos)
>>>> ├sdf1 1.82t [8:81] MD raid6 (5) inactive 'ion:0'
>>>> {4cae433f-a40a-fcf5-f9ab-a91dd8217b69}
>>>> ├sdf2 1.30g [8:82] MD raid0 (3) inactive 'ion:1'
>>>> {a20b70d4-7ee1-7e3f-abab-74f8dadb8cd8}
>>>> └sdf3 184.98g [8:83] ext4 '198GB' {e4fc427a-4ec1-48dc-8d9b-bfcffe06d42f}
>>>>
>>>>
>>>> If I try:
>>>>
>>>> [root@ion ~]# mdadm --assemble --scan
>>>> mdadm: /dev/md/0 assembled from 1 drive - not enough to start the array.
>>>> mdadm: /dev/md/1 assembled from 1 drive - not enough to start the array.
>>>>
>>>> From dmesg:
>>>>
>>>> [ 1227.671344] sda: sda1
>>>> [ 1227.680392] md: sda does not have a valid v1.2 superblock, not importing!
>>>> [ 1227.680414] md: md_import_device returned -22
>>>> [ 1227.680462] md: md0 stopped.
>>>> [ 1227.707969] sdb: sdb1
>>>> [ 1227.718598] md: sdb does not have a valid v1.2 superblock, not importing!
>>>> [ 1227.718611] md: md_import_device returned -22
>>>> [ 1227.718631] md: md0 stopped.
>>>> [ 1286.334542] md: md0 stopped.
>>>> [ 1286.338250] md: bind<sdf1>
>>>> [ 1286.338390] md: md0 stopped.
>>>> [ 1286.338400] md: unbind<sdf1>
>>>> [ 1286.348350] md: export_rdev(sdf1)
>>>> [ 1286.372268] md: bind<sdf1>
>>>> [ 1286.373390] md: md1 stopped.
>>>> [ 1286.373936] md: bind<sdf2>
>>>> [ 1286.373977] md: md1 stopped.
>>>> [ 1286.373983] md: unbind<sdf2>
>>>> [ 1286.388061] md: export_rdev(sdf2)
>>>> [ 1286.405140] md: bind<sdf2>
>>>>
>>>> [root@ion ~]# cat /proc/mdstat
>>>> Personalities :
>>>> md1 : inactive sdf2[2](S)
>>>> 1366104 blocks super 1.2
>>>>
>>>> md0 : inactive sdf1[3](S)
>>>> 1952015360 blocks super 1.2
>>>>
>>>> unused devices: <none>
>>>>
>>>>
>>>> If I try manually (I'm not sure of the order though):
>>>>
>>>> [root@ion ~]# mdadm --assemble --readonly --verbose /dev/md0 /dev/sda
>>>> /dev/sdb /dev/sdd /dev/sde
>>>> mdadm: looking for devices for /dev/md0
>>>> mdadm: /dev/sda is identified as a member of /dev/md0, slot 3.
>>>> mdadm: /dev/sdb is identified as a member of /dev/md0, slot 0.
>>>> mdadm: /dev/sdd is identified as a member of /dev/md0, slot 5.
>>>> mdadm: /dev/sde is identified as a member of /dev/md0, slot 1.
>>>> mdadm: added /dev/sde to /dev/md0 as 1
>>>> mdadm: no uptodate device for slot 2 of /dev/md0
>>>> mdadm: failed to add /dev/sda to /dev/md0: Invalid argument
>>>> mdadm: no uptodate device for slot 4 of /dev/md0
>>>> mdadm: added /dev/sdd to /dev/md0 as 5
>>>> mdadm: failed to add /dev/sdb to /dev/md0: Invalid argument
>>>> mdadm: /dev/md0 assembled from 2 drives - need 5 to start (use --run to insist).
>>>>
>>>>
>>>> Any idea where I should start?
>>>>
>>>> Thanks
>>>> Mathias
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