Re: map mainboard sata connector to device name

[Michael Stone <mstone@debian.org>]

On Wed, Apr 09, 2025 at 09:36:11AM -0400, Michael Stone wrote:
> On Wed, Apr 09, 2025 at 01:41:21PM +0200, Petric Frank wrote:
> > Am Mittwoch, 9. April 2025, 11:35:27 CEST schrieb tomas@tuxteam.de:
> > > Does /dev/disk/by-path fulfil your needs?
> >
> > Not exactly. The names are like pci-0000-0b:00:0-ata-4 and
> > pci-0000-0d:00:0-ata-1.
>
> Yes, that's necessary to account for multiple sata controllers.
>
> > Can i simply match *ata-<number> and take the "<number>" as connector id on the
> > mainboard ?
>
> No. The number is the sata device number on a particular controller. 
> They can overlap between controllers. E.g.:
>
> pci-0000:2b:00.0-ata-1
> pci-0000:2b:00.0-ata-2
> pci-0000:2b:00.0-ata-3
> pci-0000:2b:00.0-ata-4
> pci-0000:2c:00.0-ata-1
> pci-0000:2c:00.0-ata-6
>
> That's from a server with 6 sata connectors and 2 m.2 sata slots. The 

that should be *8* sata connectors, with which the math makes sense

> 6 devices listed are all on sata connectors, and you can see that on 
> the second controller one is device 1 and one is device 6, with the 2 
> unused connectors and the m.2 slots using some combination of 
> 2,3,4,5--they are clearly not numbered sequentially. On the 
> motherboard they're labeled SATA_[01234567] and M2_[12]. There's no 
> particular relationship between how things are laid out on the 
> motherboard and what they're connected to internally.
>
> As someone else suggested, it's typically more useful to stick with 
> filesystem UUIDs and such rather than trying to map things physically.