# How to boost merge rate for \`\_forcemerge\`

**URL:** https://discuss.elastic.co/t/how-to-boost-merge-rate-for--forcemerge/66071
**Category:** Elasticsearch
**Created:** [November 15, 2016, 8:46am UTC](https://discuss.elastic.co/t/how-to-boost-merge-rate-for--forcemerge/66071 "2016-11-15T08:46:51Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Brad\_Jungsu\_Heo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/brad_jungsu_heo/32/13135_2.png) [@Brad\_Jungsu\_Heo](https://discuss.elastic.co/u/Brad_Jungsu_Heo)
#### Post date: [November 15, 2016, 8:46am UTC](https://discuss.elastic.co/t/how-to-boost-merge-rate-for--forcemerge/66071/1 "2016-11-15T08:46:51Z")

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Hi, all.

I'm running ES 2.3 and currently testing `_forcemerge`.

The problem which I have is that merge rate for `_forcemerge` is too slooow.

My test ES cluster is idle (there is no indexing, no searching), but 1 hour later since `_forcemerge` has been started, only 1,400 segments are merged. and only 1 cpu is running and Disk I/O is low.

It seems like `index.merge.scheduler.max_thread_count` or `indices.store.throttle.max_bytes_per_sec` is not working.

Is there any way to increase merge rate for `_forcemerge`?

Thanks in advanced.

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<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 13, 2016, 8:46am UTC](https://discuss.elastic.co/t/how-to-boost-merge-rate-for--forcemerge/66071/2 "2016-12-13T08:46:54Z")

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