HANA x86 1.0 migrations to HoP 2.0 LE and/or to HANA x86 2.0 via HANA system replication have a serious "showstopper" if not validated and done in the "correct" architecture
Replication is supported and allowed by SAP only when architecture is same between source and target, regardless which server, x86 or POWER.
HANA 1.0 SDC (single tenant) - > HSR to HANA 2.0 SDC (single tenant) -> upgrade to HANA 2.0 MDC
HANA 1.0 SDC (single tenant) -> upgrade to HANA 1.0 MDC (multi tenant) -> HSR to HANA 2.0 MDC
What is necessary, which issues can occur etc. has been written by external consultant, Jens Gleichmann, XLC GmbH, in a sap blog:https://blogs.sap.com/2019/01/20/hana-1.0-upgrade-scenarios/