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The hardware situation is as such :

  • a motherboard (MSI X99A SLI Plus),
  • two (2) Samsung 860 Pro SSDs connected on SATA-1 and SATA-2 of the motherboard.
  • five (5) identical HDDs connected on SATA-3, SATA-4, SATA-5, SATA-6, SATA-7

The BIOS correctly sees two SSDs on the two first SATA port, and all following HDD on following port.

Issue : Debian, Ubuntu, and Proxmox see one of the HDDs first as sda, then the two SSDs sdb and sdc, and then the HDDs again as sdd, sde, sdf, sdg

Expected : The SSD connected to SATA-1 and SATA-2 as sda and sdb. Then all the HDDs on the following letters.

I would like to get the expected behavior, for ease of understanding/maintenance.

What the bios sees

What a debian based OS sees

Annoying Technology
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1 Answers1

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SATA ports have no influence on what /dev/sdX they get. The Linux kernel assigns the letters based on what is detected first. When mounting drives etc it’s much safer and easier to use the UUID of the drive as it is persistent

Timothy Frew
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  • According to this accepted answer https://superuser.com/questions/940060/which-sata-port-is-my-disk-connected-to the port numbers on the motherboard *should* correspond to the sdX letter. As stated in the original question, the behavior is expected for clarity's sake. I am not planning on manually using /dev/sdX for anything but clarity as the machine is a Proxmox node. – Annoying Technology Jul 28 '20 at 08:41
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    Let’s put this a different way. If I have one drive and have it in sata port 3... I wouldn’t get /dev/sdc – Timothy Frew Jul 28 '20 at 09:04
  • Alright, my OCD will have to settle for un-ordered list of drives. Thanks. – Annoying Technology Jul 28 '20 at 09:32