Accessing DASD by udev-created device nodes

Use udev-created device nodes to access a particular physical disk space, regardless of the device name that is assigned to it.

Example

The following example is based on these assumptions:
  • A DASD with bus ID 0.0.b100 has two partitions.
  • The standard device node of the DASD is dasdzzz.
  • udev creates the following device nodes for a DASD and its partitions:
    /dev/disk/by-path/ccw-0.0.b100
/dev/disk/by-path/ccw-0.0.b100-part1
/dev/disk/by-path/ccw-0.0.b100-part2
Instead of issuing: 
# fdasd /dev/dasdzzz
issue: 
# fdasd /dev/disk/by-path/ccw-0.0.b100
In the file system information in /etc/fstab replace the following specifications: 
/dev/dasdzzz1 /temp1 btrfs defaults 0 0
/dev/dasdzzz2 /temp2 btrfs defaults 0 0
with these specifications: 
/dev/disk/by-path/ccw-0.0.b100-part1 /temp1 btrfs defaults 0 0
/dev/disk/by-path/ccw-0.0.b100-part2 /temp2 btrfs defaults 0 0

You can make similar substitutions with other device nodes that udev provides for you.