How to upgrade from SLES 11 SP3 to SLES 15 SPx

I'm new to SLES OS, could you help me on below requests.
How to upgrade from SLES 11 SP3 to SLES 15 SP3? Current server is diskless boot running with SAP Hana
Can we upgrade from SLES 11 SP3 to SLES 15 SP3 or higher without damage existing data?
How to create NetBoot SLES15 initrd's?
Thank you in advance.
Regards
Naresh

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