Am 18. May, 2025 schwätzte James Mcphee via PLUG-discuss so:
moin moin,
I've run into things similar and it depends on what you're running. If
it's udev, make a rule in /etc/udev/rules.d/numbered-rule.rules with
SUBSYSTEM=="block", ACTION=="add", ENV{ID_FS_UUID}==
"123e4567-e89b-12d3-a456-426614174000", NAME="sda"
or whatever. Dunno if this does what you want, but you can pretty much do
something like this to handle that kinda thing if you're running udev.
I'd been looking at UDEV rules, but hadn't made any progress.
I've now found udevadm.
sudo udevadm info --query=all --name=/dev/sdf1 | grep -i uuid
that gave me several options, but I also found a claim that systemd-udev
won't let you change a device name, only add an alias.
My disks already have more aliases than my shell environement.
found udevadm test, which gives a lot of output.
This has some recognizable paterns -
/usr/lib/udev/rules.d/60-persistent-storage.rules
Still need to look at /dev/md/${NAME} for mdadm.
ciao,
der.hans
On Sat, May 17, 2025 at 10:20 PM der.hans via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:
Am 17. May, 2025 schwätzte Ryan Petris via PLUG-discuss so:
You can't, unfortunately. The only thing in /dev you can technically
rename are network interfaces; the rest you can only add symlinks for,
which is what for instance /dev/disk/by-partlabel/* is.
A shame, I like long path names :)
Why do you care what mdadm shows for device names anyway? If you're
concerned that it will pick up the wrong disk on reboot, it won't
because internally it's using its own identifiers to find the right
drives, and will snow you whatever /dev/sd* it happens to end up
It picked up the wrong devices when powering the drive bay down and up
again. mdadm was showing and trying to use the orginal sd names rather
than the newly assigned names.
I will experiment more with mdadm. It's been a while since I used it, so
was expecting some reacquaintance exercises to be necessary.
ciao,
der.hans
on when running mdadm commands. If you want to figure out which
/dev/sd* device belongs to your disk label, you can just run `readlink
/dev/disk/by-partlabel/raid...`.
On Sat, May 17, 2025, at 6:46 PM, der.hans via PLUG-discuss wrote:
moin moin,
I'm using a USB JBOD enclosure to build a RAID set.
Restarting the enclosure ends up with the drives on new names, e.g. sda,
sdb and sdc come back sdd, sde and sdf.
I added labels to my disk partitions and was hoping to use them, e.g.
/dev/disk/by-partlabel/raid{0,1,2}, but mdadm turned them back to
/dev/sd{d,e,f} names as members of the array
Anyone know how I can either get /dev/sd names not to change for
removable
media or get mdadm to accept the names I want to use?
I'd rather the latter.
ciao,
der.hans
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