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SUSE Linux Enterprise Server for z Systems and LinuxONE is the market-leading Linux operating system for IBM z Systems for some good reasons.

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Security Approach: Integration with RACF, ACF2, TopSecret, AD, AppArmor Security Framework, SELinux SLES has a simpler, more pragmatic approach SELinux
Management Simplicity: YaST / WebYaST, Starter System Integrated management tools are unique to SLES No
Package Management Zypp provides for fast and easy package management YUM
High Availability Included Complete HA stack included at no additional cost Not included with Red Hat Enterprise Linux for IBM z Systems. Third party product available at additional cost, but not integrated with operating system
MS Interoperability Microsoft recommends SLES No
SAP SAP recommends SLES, Special support SKU Certified
Common Code Base Consistency across all architectures Not traceable
Market Share ~80% i ~20%