What is udev and how do you write custom udev rules in systemd environments (RHEL 7 and later) ?

Solution Verified - Updated -

Issue

  • What is udev and how do you write custom udev rules in RHEL7 ?
    • How to add/create a customer device file through udev?
    • Udev rules to create ASM devices in RHEL7
    • How to write an udev rule to change parameters like nr_request and/or to change the I/O scheduler of a device?
    • Configuring persistent names for tape devices using udev in RHEL7.

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • udev

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