Peter, thanks for your help. Below are the answers.
On Jun 2, 2014, at 05:36, Kővári Péter <peter@xxxxxxxxxxxxxx> wrote:
> Hi Davide,
>
> Open / ssh a console on your NAS box, and issue the following command and send us the results:
> $ cat /proc/mdstat
Personalities :
unused devices: <none>
>
> Please also issue the following commands
>
> mdadm --examine /dev/sdX[Y]
$ mdadm —examine /dev/sdb
mdadm: cannot open /dev/sdb: Permission denied
$ sudo mdadm —examine /dev/sdb
/dev/sdb:
MBR Magic : aa55
Partition[0] : 1953520002 sectors at 63 (type fd)
$ sudo mdadm —examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : f8a943c7:2ffa13d0:9770de34:eca2e81c (local to host gecko)
Creation Time : Tue Mar 3 23:27:50 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Wed May 28 21:52:54 2014
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 2d5185d8 - correct
Events : 46
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
> mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.00
UUID : f8a943c7:2ffa13d0:9770de34:eca2e81c (local to host gecko)
Creation Time : Tue Mar 3 23:27:50 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Wed May 28 21:52:54 2014
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 2d5185ea - correct
Events : 46
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 1 8 33 1 active sync /dev/sdc1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
…etc. So it seems to me that we are OK, with the RAID 5 set setup on /dev/sdb1, /dev/sdc1, /dev/sdd1, /dev/sde1.
>
> Where X is one of the raid drive's name and Y is the partition number, if you created the raid set on partitions. (If not, then leave the number.) So, for example (assuming that your OS drive is /dev/sda, so your raid drives are /dev/sdb, /dev/sdc and so on) issue the following commands:
>
> $ mdadm --examine /dev/sdb
> or
> $ mdadm --examine /dev/sdb1
>
> and so on for all 4 drives. And send back the results.
>
> p.s.
> Before everything else, you might try auto assembling th eset by:
> $ mdadm -v --assemble —scan
Trying this holding my breath….
> mdadm -v --assemble --scan
mdadm: looking for devices for /dev/md0
mdadm: no recogniseable superblock on /dev/dm-1
mdadm: no recogniseable superblock on /dev/dm-0
mdadm: no RAID superblock on /dev/sde
mdadm: no RAID superblock on /dev/sdd
mdadm: no RAID superblock on /dev/sdb
mdadm: no RAID superblock on /dev/sdc
mdadm: no RAID superblock on /dev/sda5
mdadm: no RAID superblock on /dev/sda2
mdadm: no RAID superblock on /dev/sda1
mdadm: no RAID superblock on /dev/sda
mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 3.
mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sdc1 is identified as a member of /dev/md0, slot 1.
mdadm: added /dev/sdc1 to /dev/md0 as 1
mdadm: added /dev/sdd1 to /dev/md0 as 2
mdadm: added /dev/sde1 to /dev/md0 as 3
mdadm: added /dev/sdb1 to /dev/md0 as 0
mdadm: /dev/md0 has been started with 4 drives.
OK, this seems successful as well. My RAID is /dev/md0.
>
> It might assemble your raid set for you successfully out of the box. (If not, send here the output.)
> If this assembles your set successfully, then you just need to save your config in /etc/mdam/mdadm.conf, do an initramfs update and you are good to go.
> So to save the config issue:
> $ mdadm --examine --scan >> /etc/mdadm/mdadm.conf
> cat /etc/mdadm/mdadm.conf
ARRAY /dev/md0 UUID=f8a943c7:2ffa13d0:9770de34:eca2e81c
>
> then update initramfs so th eset will auto assmble on next boot:
> $ update-initramfs -k all -u
> update-initramfs -k all -u
update-initramfs: Generating /boot/initrd.img-3.13.0-24-generic
But now:
> sudo fdisk -l
Disk /dev/md0: 3000.6 GB, 3000606523392 bytes
2 heads, 4 sectors/track, 732569952 cylinders, total 5860559616 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 393216 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn’t contain a valid partition table
How do I fix this and how to I gain access to /dev/md0?
Thanks,
Davide
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