Random disk assignation for NVME disk on baremetal

[piellick]

Hi everyone,

we are facing a strange behavior on disk assigniation. It was tested with talOS 1.8.3 and 1.9 .

We configure talos with :

machine:
  install:
    disk: /dev/nvme0n1

We used baremetal with two NVME:

• nvme0n1
• nvme1n1

On maintenance mode, talosclt get disks return correct disk list with the right path (/dev/nvme0n1 and /dev/nvme1n1).
I could provide some captures later.

Talos Deployment work well but assign randomly nvme0 or nvme1 for OS deployment. Someone already had this case?

thanks a lot 🙏

[smira]

This is not an issue in Talos, but rather the way hardware and Linux works. Disk enumeration is random, so whatever was nvme0 might on next boot become nvme1.

You can use either device selectors, or /dev/by-id symlinks to provide a stable assignment (if required).

It's not a problem for Talos install, as this instruction is used only once on initial install, and later on Talos will find its install disk, no matter what name it has.

[piellick]

hi @smira this confirms our investigation. Thanks a lot !