"The current limitation or pause is when the ram buffer is flushing to disk "
-> when an optimize starts and is running ~4 hours, you say, that DIH is flushing the doc`s during this "pause" into the index ? ----- ------------------------------- System ---------------------------------------- One Server, 12 GB RAM, 2 Solr Instances, 7 Cores, 1 Core with 31 Million Documents other Cores < 100.000 - Solr1 for Search-Requests - commit every Minute - 5GB Xmx - Solr2 for Update-Request - delta every Minute - 4GB Xmx -- View this message in context: http://lucene.472066.n3.nabble.com/Updates-during-Optimize-tp2811183p2815064.html Sent from the Solr - User mailing list archive at Nabble.com.