FAI install with huge JBODs present - disk/by-id?

[Markus Köberl]

On Tuesday, 17 December 2024 16:57:24 CET Steffen Grunewald wrote:
> Hi Andrew,
> 
> On Tue, 2024-12-17 at 22:34:04 +1300, Andrew Ruthven wrote:
> > My provided script is in:
> > https://lists.uni-koeln.de/pipermail/linux-fai/2024-January/013143.html
> 
> Now that I dug this out of the archive, I remember having seen it before ;)
> Part of this went into the latest version of FAI, right?
> I like the "host_disks()" approach, but found that in this particular case
> it might make more sense to use /dev/disk/by-path because of the inherent
> sorting - when setting up a RAID one wants to know where to find the parts
> in case a replacement was necessary ;)
> 
> > https://lists.uni-koeln.de/pipermail/linux-fai/2024-January/013136.html
> > https://lists.uni-koeln.de/pipermail/linux-fai/2024-January/013149.html
> 
> Now that I checked those, I'm wondering whether it would make sense to
> add some "alias" feature (so one could identify a disk like
>  /dev/disk/by-path/pci-0000:06:00.0-ata-1.0
> either in disk_config (and use that alias like "disk1"), or write some
> mapping (to additional.var?) to later reference the disk under the new name.
> 
> No matter how many helpers (like "smallest/biggest disk" etc.) there are,
> for the next machine one would need yet another one...

Maybe a good idea is to look at the vdev_id script from openzfs.
It uses a config file vdev_id.conf and can handle different topology, 
multipath and aliases to create links under /dev/disk/by-vdev

https://openzfs.github.io/openzfs-docs/man/master/5/vdev_id.conf.5.html
https://openzfs.github.io/openzfs-docs/man/master/8/vdev_id.8.html

Spending some work to integrate it into fai might be worth as you use zfs on 
the system...


regards
Markus Köberl
-- 
Markus Koeberl
Graz University of Technology
Signal Processing and Speech Communication Laboratory
E-mail: markus.koeberl at tugraz.at
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