wipe 2 disks coming from an other NAS

Hi,

I have successfully installed OMV7 on my new Ugreen NAS 2 bays.
Before installing OMV, I had the UGOS (the native ugreen os also debian based).

Now I want to start a fresh install and need to wipe the 2 disks.
Those are 2 identical TOSHIBA MG09ACA16TE

When I am on Storage|Disks and select any of the 2 disks and choose Wipe and Quick, I have this error:

 500 - Internal Server Error Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LC_ALL=C.UTF-8; export LANGUAGE=; blockdev --rereadpt '/dev/sdb' 2>&1' with exit code '1': blockdev: ioctl error on BLKRRPART: Device or resource busy 

I repeated this operation about 10 times.

How can I wipe those disks to be able to start fresh with those?
I will use Raid1

thank you

Quote from ryecoaaron

If those disks have a raid array on them, you need to stop the array.

Yes, they were also on a raid1.
How do I stop the array?

Thank you

Quote from ryecoaaron

If those disks have a raid array on them, you need to stop the array.

ryecoaaron, I think I find a way:
I start a secure wipe (not quick) and stopped after few lines.
I did this in both disks. Now I start the wipte: quick and it worked.
There are no error messages. created a raid1 now in OMV.
I dont see a pool!
I now see /dev/sdb with a total of 29.10TiB
The disks are 16T x2
Should I not see only 16T available since raid1 use one disk as a copy?

Am I doing something wrong?

Quote from Krisbee

Have you installed the MD plugin on OMV7? Because it looks like you've created BTRFS RAID1 profile.

My goal is to create a raid1

I did not install any plugin yet.
You mean this?
penmediavault Linux MD (Multiple Device) plugin

maybe I dont understand how RAID works or how it works in OMV.

My goal is to have RAID1 formatted in BTRFS
It seems I can do that by simply wipe the disk and create and mount a file system. Choosing the file system I want (BTRFS) and the disks to be used after selecting RAID1.
Would that give me a raid1? (the creation process seem to me too quick to mirror 16TB )

Label: none uuid: e32f6490-c13a-434b-8039-1d94d100e3a3
 Total devices 2 FS bytes used 160.00KiB
 devid 1 size 14.55TiB used 2.01GiB path /dev/sda
 devid 2 size 14.55TiB used 2.01GiB path /dev/sdb
Data, RAID1: total=1.00GiB, used=0.00B
System, RAID1: total=8.00MiB, used=16.00KiB
Metadata, RAID1: total=1.00GiB, used=144.00KiB
GlobalReserve, single: total=5.50MiB, used=0.00B

What do you mean with "If you want a traditional Linux software raid mirror"?
sound like if I dont use MD, there is a non traditional form of Raid mirroring?

PS
I have installed MD

when the installation finished, I got kicked out the webUI with a message"software failure... could not read the all thing.
could not reboot not even SSH the nas. I had to pull the plug.
Now I am back but it does not connect with domain name, only IP address.
I dont know what the MD has done but made things different!

Ok, thank you.

Macom posted a really good link: https://www.dont-panic.cc/capi…rfs-raid1-vs-mdadm-raid1/

Things are getting clear what to use.

As a since note, as soon as I installed MD, my system became unresponsive and I actually lost the SMB service (is there but cant be founds from any of the computers I have).
Sounds illogical that MD did anything on the SAMBA service but it just happen at the very end of MD installation. Nor I can access it with domain name anymore!

Quote from Krisbee

If you want to repeat the questions on this thread that you asked here: RE: Raid Setup Settings you might get an answer ( it's not possible to "quote" from another thread ).

Not sure I understand what you mean here.
I got to the conclusion that BTRFS RAID1 is best over BTRFS RAID1 MD from the article I mention.
That article explained very well what is the difference among the 2 options.

I got to understand that MD is best for Ext4 but not so much for BTRFS!

In case I got that the wrong way, Please let me know.