The RAID seems to have just vanished. I don't know except it might have to do with what happens when the NVMs have an abrupt power loss. I am guessing it could be due to a bad design in either the drives or motherboard. I am not sure what happens when there is a low battery event, check /etc/acpi/events. Could be a acpi problem.

I'm surprised, but thinking. If the 3 Raid 0 disks were your raid system, might they only need accounting on the one that was keeping track? There's 2 to stripe the data accross. What me interested is: What is feeding your pc data in excess of 2GB/S, so a raid array on nvmes is needed? Humour me and check the 3 of them. The others would not be partitioned.

It's also a high spec laptop with 3 nvme slots on board.

I would use the 3 NVMes in raid0 configuration just to store simulations data and rendering data. (heavy)
I thought in this way the time could be divided by 3, is it right ?

But if the gain is not so significant.. then.. I use the disks like normal disks.

What do you suggest ?

Use them as normal disks. I would get your ssds out and increase disk speed approximately ×4.

When running raid 0 (striped) anything that may corrupt data or cause failure of one drive will often wipe out the entire array since the data is striped across all drives to make a whole.

Usually the purpose of using raid 0 is that one drive is too small and striping it across multiple drives gains space. There is the drawback that now there are multiple failure points with no redundancy and a single failure can lose all the contained data.

Raid 1 (mirrored) and/or raid 10 (raid 1 + 0) -- (mirrored and striped) is one way to gain at least some redundancy and less chance of a single failure causing data loss.

Raid 1 loses a little with writes but gains with reads.
Raid 0 loses on reads but gains on writes.

Your use with nvme drives would likely lose all around with raid since now the system and the raid manager are involved in both read and write, while using the drives bare is probably faster overall than raid.

Thanks all of you.

I'll use the drives in simple way.

Thanks for your advices.