# How i to analysis the es cluster?

**URL:** <https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146>\
**Category:** Elasticsearch\
**Created:** [July 11, 2016, 3:22am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146 "2016-07-11T03:22:06Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![famoss](https://avatars.discourse-cdn.com/v4/letter/f/67e7ee/32.png) [@famoss](https://discuss.elastic.co/u/famoss)\
**Post date:** [July 11, 2016, 3:22am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/1 "2016-07-11T03:22:06Z")

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I find my `es` cluster sometimes index docs(use bulk api) very slow.  
At that time,I use `cat thread_pool` api find `bulk.active` are all less 2(bulk.size are all 32).And i find my server's CPU's usage are also very little.And the disk's write/per second just nearly 80M/s (3 800G+ SSD disk use raid0).And there are no query at that time.  
How i to find out why `es` index slow?

`es`:v2.3.1  
Thanks!

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**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:** [July 11, 2016, 3:25am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/2 "2016-07-11T03:25:28Z")

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How slow?  
How large are your bulk requests?

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**Author:** ![famoss](https://avatars.discourse-cdn.com/v4/letter/f/67e7ee/32.png) [@famoss](https://discuss.elastic.co/u/famoss)\
**Post date:** [July 11, 2016, 3:31am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/3 "2016-07-11T03:31:35Z")

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@warkolm,Thank you!

Normally,my es cluster(6 nodes) can index 10w/s,but some times it just 1-2w/s.  
Bulk batchSize 1500,average pre doc's size is 1K.

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**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:** [July 11, 2016, 3:32am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/4 "2016-07-11T03:32:55Z")

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> [@famoss](#):
>
> 10w/s

What is `w/s`?

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**Author:** ![famoss](https://avatars.discourse-cdn.com/v4/letter/f/67e7ee/32.png) [@famoss](https://discuss.elastic.co/u/famoss)\
**Post date:** [July 11, 2016, 3:33am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/5 "2016-07-11T03:33:51Z")

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@warkolm

I get the `Indexing Rate` from marvel,just like '100000/s'.

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**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:** [July 11, 2016, 3:44am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/6 "2016-07-11T03:44:16Z")

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Right, but I don't know what the `w` has to do with it.  
Is it 10 per second?

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**Author:** ![famoss](https://avatars.discourse-cdn.com/v4/letter/f/67e7ee/32.png) [@famoss](https://discuss.elastic.co/u/famoss)\
**Post date:** [July 11, 2016, 3:52am UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/7 "2016-07-11T03:52:16Z")

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@warkolm 100000 per second. . Sorry ,we say ten thousand as w..

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:36pm UTC](https://discuss.elastic.co/t/how-i-to-analysis-the-es-cluster/55146/8 "2017-07-05T22:36:44Z")

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