# Number of Master eligible nodes **URL:** \ **Category:** Elasticsearch\ **Created:** [December 17, 2013, 4:52pm UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916 "2013-12-17T16:52:33Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![search](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@search](https://discuss.elastic.co/u/search)\ **Post date:** [December 17, 2013, 4:52pm UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/1 "2013-12-17T16:52:33Z")
I am trying to setup a large cluster 60nodes on 10physical servers (very powerful servers). How many master eligible nodes should I setup? Would the following be sufficient in this case? 10 master only nodes (no data) - One per physical machine 50 data only nodes (not master) - 5 per physical machine discovery.zen.minimum\_master\_nodes: 6 (derived from ... 10/2 + 1 to solve the split brain problem.) Thanks. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/470dea6c-0cf0-4346-8cc9-a991e49bf465%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/470dea6c-0cf0-4346-8cc9-a991e49bf465%40googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [December 17, 2013, 9:42pm UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/2 "2013-12-17T21:42:22Z")
Without knowing the specs of the machines, that looks reasonable. Regards, Mark Walkom Infrastructure Engineer Campaign Monitor email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) web: [www.campaignmonitor.com](http://www.campaignmonitor.com) On 18 December 2013 03:52, Search User [feedworks@gmail.com](mailto:feedworks@gmail.com) wrote: > I am trying to setup a large cluster 60nodes on 10physical servers (very > powerful servers). How many master eligible nodes should I setup? Would the > following be sufficient in this case? > > 10 master only nodes (no data) - One per physical machine > 50 data only nodes (not master) - 5 per physical machine > > discovery.zen.minimum\_master\_nodes: 6 (derived from ... 10/2 + 1 to solve > the split brain problem.) > > Thanks. > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/470dea6c-0cf0-4346-8cc9-a991e49bf465%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/470dea6c-0cf0-4346-8cc9-a991e49bf465%40googlegroups.com) > . > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAEM624ZEn4VstaCHvoJiefvRR4mvW%3Db7X3tVifevq-Db5wbevg%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAEM624ZEn4VstaCHvoJiefvRR4mvW%3Db7X3tVifevq-Db5wbevg%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [December 18, 2013, 1:31am UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/3 "2013-12-18T01:31:47Z")
Start with 1 ES node per server. It makes not much sense to have 6 nodes per server, even on "very powerful" servers. Jörg -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoE8hfev5mtsa0T4Trv3jXj0MqJQJQ24PyEyfOwKKKMYeQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoE8hfev5mtsa0T4Trv3jXj0MqJQJQ24PyEyfOwKKKMYeQ%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![search](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@search](https://discuss.elastic.co/u/search)\ **Post date:** [December 22, 2013, 12:49am UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/4 "2013-12-22T00:49:37Z")
Thanks Jorg. But can you please explain why it doesn't make sense? I started with one and increased the data nodes. With more data nodes, I started seeing better indexing throughput and my queries seem to be running fast. I don't have numbers to give you but I can definitely run the experiment and post. Thanks On Tuesday, December 17, 2013 8:31:47 PM UTC-5, Jörg Prante wrote: > Start with 1 ES node per server. It makes not much sense to have 6 nodes > per server, even on "very powerful" servers. > > Jörg -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/ea7933b8-1d01-4e71-8a71-c916d27e2c61%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/ea7933b8-1d01-4e71-8a71-c916d27e2c61%40googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [December 22, 2013, 11:20am UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/5 "2013-12-22T11:20:20Z")
If you install ES with default configuration, you install developer mode: small heap, zen discovery, all reasonable feature enabled, many automatic configurations for resource utilization. You can change the ES configuration to adapt better to the RAM of your server. ES scales to the number of CPU cores automatically. Also there are recommendations for running JVM on large servers. So, there is no need to run more than one ES JVM per server. Each JVM adds overhead to the layer between ES und OS, and requires network communication overhead - it must be slower than a single large node. Jörg -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFHNgoZ%2Bc6-J51X5WeKusES%3DnNXN2aL2%3DXZ5UGxHu0a6g%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFHNgoZ%2Bc6-J51X5WeKusES%3DnNXN2aL2%3DXZ5UGxHu0a6g%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:59am UTC](https://discuss.elastic.co/t/number-of-master-eligible-nodes/14916/6 "2017-07-06T01:59:42Z")