[gentoo-user] Udev rules for identical hard drives

[Alex Schuster]

Hi there!

I do not understand the numbering of my hard drives. There may be some
inherent logic, but whenever I make some changes, like replacing drives,
or changing BIOS settings, the order changes. Maybe it's even more random.

So I made some udev rules like this, and my drives are called /dev/hd1,
hd2 and hd3:

SUBSYSTEMS=="scsi", KERNEL=="sd?", ATTRS{model}=="SAMSUNG HD154UI",
SYMLINK="hd1"

This works fine, and this way I can address them in scripts, smartd and
hdparm config files and such. But now I have two identical drives. I had
this before with the drive above, but while being identical models, the
two drives differed a little in size, so I just had to add ATTR{size}.
This does not help with my current drives, and I find nothing
in /sys/block/sd?/device/ that differs. Could there be another way to
distinguish the drives, like looking at the partition scheme or something?

	Wonko