On 3/8/2018 2:55 PM, Dominique Bejean wrote: > Disk I/O are critical for high performance Solrcloud.
This statement has truth to it, but if your system is correctly sized, disk performance will not have much of an impact on Solr performance. If upgrading to faster disks does improves long-term query performance, the system probably doesn't have enough memory installed. There can be other causes, but that is the most common. When there is enough memory available to allow the operating system to effectively cache the index data, Solr will not need to access the disk much at all for queries -- all that data will be already in memory. Indexing will still be dependent on disk performance even when there is plenty of memory, because that will require writing new data to the disk. https://wiki.apache.org/solr/SolrPerformanceProblems This is my hammer. To me, your question looks like a nail. :) Thanks, Shawn
