Normally the volume size of primary side can be larger than the secondary side.
Because per default system replication snapshots are preserved for 120 minutes in primary side before they are dropped.
You can find more detailed information and the related parameter in SAP note 1999880.
In this article we talk about a situation that the size of the primary system is much smaller than secondary system.
HANA Database 1.0 all revisions
system replication, hdbnsutil, reclaim, hdbcons, shink, HANA studio, register , KBA , HAN-DB-HA , SAP HANA High Availability (System Replication, etc.) , HAN-DB , SAP HANA Database , How To
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