Po-Yu Chuang [ratbert.chu...@gmail.com] wrote: > [...] Everything works fine now, but I noticed that the load > average of the server is high because there is constantly > heavy disk read access. Please point me some directions.
> RAM: 18G > Solr home: 185G > disk read access constantly 40-60M/s Solr search performance is tightly coupled to the speed of small random reads. There are two obvious ways of ensuring that in these days: 1) Add more RAM to the server, so that the disk cache can hold a larger part of the index. If you add enough RAM (depends on your index, but 50-100% of the index size is a rule of thumb), you get "ideal" storage speed, by which I mean that the bottleneck moves away from storage. If you are using spinning drives, the 18GB of RAM is not a lot for a 185GB index. 2) Use SSDs instead of spinning drives (if you do not already do so). The speed-up depends a lot on what you are doing, but is is a cheap upgrade and it can later be coupled with extra RAM if it is not enough in itself. The Solr Wiki has this: https://wiki.apache.org/solr/SolrPerformanceProblems And I have this: http://sbdevel.wordpress.com/2013/06/06/memory-is-overrated/ - Toke Eskildsen
