Device Juggeling after every boot

Problem:

After every boot the devices (/dev/sd[a-z]) are not in order of hardware-slots, in short: The assignment of /dev/sd* was permanent altered (by least two devices!), eg:

# demo out from df
Filesystem      ... Mounted on
/dev/sda2       ... /mount/sda2
/dev/sdb1       ... /mount/sdc1
/dev/sdc1       ... /mount/sdf1
/dev/sdd1       ... /mount/sdd1
/dev/sde1       ... /mount/sde1
/dev/sdf9       ... /mount/sdb9

What happend?

Some kernel commits (like: 08fb080 „Update config files: make SCSI/ATA drivers modules again“), affects the order in which drivers are initialized. In particular, USB devices may now be scanned first.

Solution:

For the solution, after Kernel 6.4.x (Tumbleweed tested OK since: 2023-10-28), 5,14,x (Leap tested OK since: 2023-10-28), do this:

echo 'softdep scsi_mod post: sd_mod sg' >>/etc/modprobe.d/sd.conf
less /etc/modprobe.d/sd.conf # check the file
dracut -f --regenerate-all
reboot

This shure to load the SCSI driver first again.

For checking usefull commands:

lsblk -f
fdisk -l