Why is the multipathing command unavailable when the Linux operating system that runs the multipathing software is rebooted?
You do not select the boot entry Linux with UltraPath generated by the multipathing software when rebooting the operating system, as shown in Figure 1 (SUSE for example). This is why the multipathing command is unavailable after the operating system is booted.
On the boot interface of the operating system, select Linux with UltraPath and press Enter to boot the operating system.
Figure 1 Boot interface of the SUSE operating system