How to make SCSI disk letters (/dev/sdX) more likely consistent across reboot in RHEL

Solution Verified - Updated -

Issue

  • How can I ensure that the same storage disk is assigned the same /dev/sdX drive letter (e.g., /dev/sda instead of shifting to /dev/sdb or /dev/sdc) after each reboot?
  • Drive letters of SCSI/SAN disks are inconsistent and change unexpectedly between boot cycles.

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

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