[PLUG] Mediasonic Probox issues

[Rich Shepard]

The Mediasonic Probox has four slots. Originally shown as /dev/sdc,
/dev/sdd, /dev/sde, and /dev/sdf.

The four disks were formatted as LVM. And I used mdadm to create /dev/md0
from the last two: sde and sdf.

Looking now at fdisk -l I find:
The primary GPT table is corrupt, but the backup appears OK, so that will be used.
Disk /dev/sde: 1.8 TiB, 2000398934016 bytes, 3907029168 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: gpt
Disk identifier: 87B50654-32EB-48EC-9659-AA9FCA8805BD

Device     Start        End    Sectors  Size Type
/dev/sde1   2048 3907029134 3907027087  1.8T Linux LVM


The primary GPT table is corrupt, but the backup appears OK, so that will be used.
Disk /dev/sdf: 1.8 TiB, 2000398934016 bytes, 3907029168 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: gpt
Disk identifier: 3D392BA1-0BA4-43A6-93C2-46B7B0725799

Device     Start        End    Sectors  Size Type
/dev/sdf1   2048 3907029134 3907027087  1.8T Linux LVM


The primary GPT table is corrupt, but the backup appears OK, so that will be used.
Disk /dev/sdg: 931.5 GiB, 1000204886016 bytes, 1953525168 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: gpt
Disk identifier: CBB788C9-2244-4FDF-AD06-487E2BAB42F4

Device     Start        End    Sectors   Size Type
/dev/sdg1   2048 1953525134 1953523087 931.5G Linux LVM


The primary GPT table is corrupt, but the backup appears OK, so that will be used.
Disk /dev/sdh: 931.5 GiB, 1000204886016 bytes, 1953525168 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: gpt
Disk identifier: 0D48188B-6B6E-49CC-A326-B2EB68FA4631

Device     Start        End    Sectors   Size Type
/dev/sdh1   2048 1953525134 1953523087 931.5G Linux LVM


Disk /dev/md0: 931.4 GiB, 1000070643712 bytes, 1953262976 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

It looks to me that /dev/sdc was changed to /dev/sdg and /dev/sdd was
changed to /dev/sdh.

I think I'll use cfdisk to remove all of /dev/sd{e,f,g,h} and start with
fresh drives in the enclosure.

What I want in that enclosure are the two 2TiB drives as a single logical
volume named data2 with ext4 on each and the two 1TiB drives as a RAID1 with
ext4 on each. My limited understanding is that the two RAID disks don't need
to be setup as a LV. Is that correct?

Both /dev/sda and /dev/sdb are in the desktop so what I want is to have the
two 2TiB disks as /dev/sbc and the two 1TiB disks as /dev/md0.

As a non-professional system/network admin I need advice from you
professionals to get the results in the next go-around.

TIA,

Rich