BMC Discovery on Oracle Linux 9 compared to previous versions

This section introduces the main system-level differences between BMC Discovery versions running on Oracle Linux 9 compared to earlier versions running CentOS 7 or Red Hat Enterprise Linux 7, and how those changes affect BMC Discovery users.

Kickstart installation is different from previous versions

The kickstart installation is different from previous versions. The installation provides the opportunity to customize the installed packages. Do not do this. The configuration of the appliance is tightly controlled, which provides better supportability and lower costs while maintaining a configuration optimized for the particular requirements of the BMC Discovery application. Additional packages may compromise the security, performance, and stability of the appliance, and will prevent the installation of operating system upgrades.

Disk allocation/naming

In appliances running on Centos 7, disks were reliably allocated /dev/sdX  files in the order of the devices on the SCSI bus, so the system disk was /dev/sda . With Oracle Linux 9, this is no longer the case. The change in disk allocation has no effect on the operation of BMC Discovery, but if you have any tests or scripts that use specific disk names, then these might fail.

Booting in a single user mode

If you need to boot in a single user mode with only essential system services running, you must specify a rescue target for systemd. See Booting-the-BMC-Discovery-appliance-in-rescue-mode-on-Oracle-Linux-9 for more information.