Adaptive compression and HADR
Both online and offline reorganization are logged and therefore replicated by HADR. By stopping HADR you will simply allow the standby to fall behind the primary, which will cause a large spike in traffic (and potential log space issues on the standby) when you restart HADR. If you don't suffer from network congestion during normal operation, there's no reason to stop HADR during reorganization. If you do, consider dropping the the standby and rebuilding it anew after the REORGs on the primary are complete.