Udev - always the same device name for your USB drives


Tested on Debian Lenny

This is how your USB drive will get the same device name (/dev/sdXX or whatever) no matter when or which USB port you plug it in.

# udevinfo -a -p $(udevinfo -q path -n /dev/sdd1)

Where /dev/sdd1 is the partition you want to always get the same device name.

You’ll get a bunch of output, but this is the interesting part :

looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb5/5-2': KERNELS=="5-2" **SUBSYSTEMS=="usb"** DRIVERS=="usb" ATTRS{configuration}=="USB Mass Storage" ATTRS{bNumInterfaces}==" 1" ATTRS{bConfigurationValue}=="1" ATTRS{bmAttributes}=="c0" ATTRS{bMaxPower}==" 2mA" ATTRS{urbnum}=="466" ATTRS{idVendor}=="059b" ATTRS{idProduct}=="0370" ATTRS{bcdDevice}=="0000" ATTRS{bDeviceClass}=="00" ATTRS{bDeviceSubClass}=="00" ATTRS{bDeviceProtocol}=="00" ATTRS{bNumConfigurations}=="1" ATTRS{bMaxPacketSize0}=="64" ATTRS{speed}=="480" ATTRS{busnum}=="5" ATTRS{devnum}=="5" ATTRS{version}==" 2.00" ATTRS{maxchild}=="0" ATTRS{quirks}=="0x0" ATTRS{authorized}=="1" ATTRS{manufacturer}=="Iomega" ATTRS{product}=="External HD" **ATTRS{serial}=="9E1718FFFFFF"**

In bold, the interesting part for our udev rule.

Edit /etc/udev/rules.d/10-local.rules (10-* should come before any other file) :

SUBSYSTEMS=="usb", ATTRS{serial}=="9E1718FFFFFF", KERNEL=="sd?1", NAME="backupdrive"

This rule will match our partition, usually detected by default as sdc1 or sdd1, thus the rule KERNEL==“sd?1”.

NAME will be the name of our device : /dev/backupdrive

Restart udev :

# /etc/init.d/udev restart

Plug your drive again, and you should see /dev/backupdrive (while still appearing in dmesg output as sdX1)

# ls -l /dev/backupdrive brw-rw---- 1 root floppy 8, 33 2010-04-10 22:33 /dev/backupdrive

Source : http://ubuntuforums.org/showthread.php?t=168221

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