Arch Linux

Rathmox

Guest

first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

I have a wierd issue with my motherboard NVMe slots.

when I have one NVMe I place it on my first NVMe slot. It's recognized as /dev/nvme0.

But when I add another on the second slot, so there are 2 NVMe drives. The first one is recognizes as /dev/nvme1 and the second one I just added as /dev/nvme0.

Do you know what's happening ?

Motherboard: MSI MPG Z490 GAMING PLUS

mpan

Member

Registered: 2012-08-01

Posts: 1,596

Website

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

I did read it three times and I still do not see, what is the issue you are experiencing.

When you insert one device, one device is being reported (“/dev/nvme0”).
When you insert two devices, two devices are being reported (“/dev/nvme0” and “/dev/nvme1”).

Everything seems fine. What is the problem?

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Paperclips in avatars? | Sometimes I seem a bit harsh — don’t get offended too easily!

Rathmox

Guest

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

Not exactly.

My main NVMe is placed on the first slot on my motherboard. When alone it's refered to as nvme0

When I add another on the second slot, so I have 2 NVMe drives, the first one is refered to as nvme1 and the second one as nvme0.

In my case, my root NVMe is usually nvme0 but when I add another NVMe, my root one becomes nvme1 and the new one I added is nvme0.

mpan

Member

Registered: 2012-08-01

Posts: 1,596

Website

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

Device names are random and one can’t rely on them.

For predictable names use UUIDs, PARTUUIDs, or the “/dev/disk/*” hierarchy.

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Paperclips in avatars? | Sometimes I seem a bit harsh — don’t get offended too easily!

Rathmox

Guest

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

This is why I use UUIDs in my config files like fstab.

But do you understand if the problem is from Linux, the motherboard, or the drives ?

mpan

Member

Registered: 2012-08-01

Posts: 1,596

Website

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

There is no problem at all. It is a normal situation. There is no specific order in which devices are expected to receive their numbers.

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Paperclips in avatars? | Sometimes I seem a bit harsh — don’t get offended too easily!

Rathmox

Guest

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

Ok I see, thanks

ImmortAlex

Member

Registered: 2023-06-14

Posts: 41

Re: first slot NVMe becomes /dev/nvme1 and second slot one is /dev/nvme0

The situation can be even more difficult.
In my case names of NVMe drives was changed after one of the kernel update (6.1->6.2, if I remember correctly). And some time later I found that they can change when I boot from rescue disk.
I do understand the reason, and why UUIDs are important, just double check every time when I do some dangerous operations with disks.