No Raid with OMV4 on Raspberry4

You may have erased the thumbdrives, but use the wipe function in OMV as well.
I believe it is not recommended to use RAID on USB connected drives. And it is not supported by OMV. I believe that power failures are extra likely to leave the array out of sync. Or something similar very, very bad. Not sure.

Zitat von warmup

Hi,
it´s my first time with OMV, but ´m not new on raspbian.
So the installation was simple I´ve used the OMV_4_Raspberry_Pi_2_3_3Plus_4.img.xz build at 17.7.2019 .
For the first try I want to use 2 USB-Sticks with 16GB an create an RAID1
I can see the to sticks and have erased them.
While choosing the Sticks in the Raid-Dialog an pressing create I get an Error-Message.

mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: size set to 15232384K
mdadm: largest drive (/dev/sdb) exceeds size (15232384K) by more than 1%
mdadm: creation continuing despite oddities due to --run
mdadm: unexpected failure opening /dev/md0

Can someone help me?

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USB Raid is not supported in the webUI... pure and simple.

If you insist on proceeding in this route, you'll need to set it up command line style.

A wiser decision would be to set up the two drives independently, then set up a simple rsync job that runs a couple times a day, that will bring the drives in sync.

Zitat von warmup

Wish hardware do i need to set up a real Raid1?

Real Raid1 no such thing and you don't need any special hardware, do a google search for mdadm, as @KM0201 has said this is simply a very bad idea. If it goes wrong without sounding rude you're on your own

You need a real computer. With at least two SATA ports.

Or you can setup RAID 1 on a Raspberry Pi using USB sticks just fine. Just don't use OMV to do it.

Use Debian, for instance. And the command line.

Why do you want to have a RAID?
My thoughts about... RAID