Again the SLES team made this really easy – using zypper and the online update repositories. Less than 15 minutes per server – and a single reboot.
Accept the recommended upgrade – and read and accept the EULA – and you’re away. For me 240MB download, 156 packages, 10 minutes of install, one reboot.
1 | SUSE Linux Enterprise Server 12 SP4 x86_64