On 1/20/2015 7:45 AM, Nimrod Cohen wrote: > All shards are on the same system each one use different port. > BTW > Data size is about 1T, memory is 192G.
If Solr has to actually go to the disk to satisfy a query, it's going to be slow. This will always be true, no matter how many disks you use. In terms of performance, disks are like molasses or a glacier compared to RAM. Even an SSD is a lot slower. Solr performance is good when all of the data that a query needs is sitting in RAM already, cached by the operating system using memory that is not allocated to programs. 192GB of RAM is nowhere near enough to assure good performance if the Solr indexes are 1TB in size. I would bet that this is true even if you put the indexes on SSD instead of spinning magnetic drives ... although performance would be better with SSD. http://wiki.apache.org/solr/SolrPerformanceProblems You should *not* run multiple Solr instances per machine. All of your index cores should be handled by one instance. Running multiple instances is a waste of resources, especially memory, which as already discussed is extremely precious when dealing with a large index. Thanks, Shawn
