linear raid gone after reboot

TheEmperor · Aug 23rd 2015

Hello,

I have the same problem as so many others and I have already read lots of threads regarding this issue.
However, I have not found a solution for my problem.

I have rebooted my OMV and all of a sudden my linear raid consisting of two brand new 6 TB WD Red disks was gone.
It was not the first time I rebooted the server, nor have I done something special before the reboot (I was resetting the permissions on a shared folder, because it was read-only for some reason).

I work as a developer and I think I have quite some technical knowledge, but my experience with raids is little and I'm a Linux newbie

Here is the output from the support tab:

Code

Personalities : [linear]
md0 : inactive sdc[1]
      5860522576 blocks super 1.2


unused devices: <none>
/dev/sda1: UUID="88f1fb03-8b90-474b-8e19-2c821eb44dd4" TYPE="ext4"
/dev/sda5: UUID="b27e24fa-da81-4019-ba96-28da337b671f" TYPE="swap"
/dev/sdc: UUID="4a0cebf8-3297-5443-fb4b-b9655c49daf8" UUID_SUB="7038d1f7-fa71-557e-3777-faccc23e956c" LABEL="omvNAS:files" TYPE="linux_raid_member"


Disk /dev/sda: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 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
Disk identifier: 0x0001496c


   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048   239855615   119926784   83  Linux
/dev/sda2       239857662   250068991     5105665    5  Extended
/dev/sda5       239857664   250068991     5105664   82  Linux swap / Solaris


Disk /dev/sdb: 6001.2 GB, 6001175126016 bytes
256 heads, 63 sectors/track, 726751 cylinders, total 11721045168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1  4294967295  2147483647+  ee  GPT
Partition 1 does not start on physical sector boundary.


Disk /dev/sdc: 6001.2 GB, 6001175126016 bytes
256 heads, 63 sectors/track, 726751 cylinders, total 11721045168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000


   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1  4294967295  2147483647+  ee  GPT
Partition 1 does not start on physical sector boundary.

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If it is neccessary I can reformat everything as the data is still available on my old NAS, but I had to copy 4 TB over the network, which I would not like to repeat if possible

Any help would be highly appreciated!

Thanks,
Robert

subzero79 · Aug 23rd 2015

Do not partition the disks (sdb-sdb1). Use them raw. You can destroy the partitions by wiping each disk.
also why a linear array if you can use a Pool solution ?

TheEmperor · Aug 24th 2015

ok, didn't know that.

Wiping sounds like all data will be gone, right?

What exactly do you mean by a Pool solution?

Thanks,
Robert

subzero79 · Aug 24th 2015

A pool solution is something we're you grab two formated and mounted filesystems and join them into another mount point. That mount point will display contents from both disks as they were one. If both are empty, depending on the solution folders will be created in a way to keep the usage balanced.
if one of the disk fails you'll loose data from that disk only.

wipe the disks means deleting its contents and erasing the partition signature.

TheEmperor · Aug 24th 2015

I read a few posts in the meanwhile about AUFS and it seems to be a bit problematic when it comes to permissions.

Is it really a better solution than a linear raid? Or should I wait for overlayfs?

Thanks

subzero79 · Aug 24th 2015

Overlayfs will come with omv3 (Debian Jessie) with backports kernel.

permissions issues exist because people don't reset their branch disk, keep insisting on the pool, but doesn't work. There is no acl support there though for aufs.

linear raid gone after reboot

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