# How to speed up the segment merging at night?
**URL:** https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267
**Category:** Elasticsearch
**Created:** [April 26, 2021, 2:27pm UTC](https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267 "2021-04-26T14:27:05Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@wangxr1985](https://discuss.elastic.co/u/wangxr1985)
#### Post date: [April 26, 2021, 2:27pm UTC](https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267/1 "2021-04-26T14:27:05Z")
The ES version is 7.11.1
I use ilm to manage my log indices
hot phase: rollover
warm phase (12 hours from rollover): forcemerge、read only、data allocation
cold phase (5 days from rollover): freeze
delete phase(10 days from rollover): delete
The average size of the shard is 40gb.
In the warm phase I set the max\_num\_segments to 5 for forcemerge.
The issue is that there are too large size of data to do forcemerge, it processes slowly, all jobs can not be done in time, so all indices stuck at forcemerge step, can not be freezed.
The infomation of "\_cat/thread\_pool/force\_merge?v" is:
node\_name name active queue rejected
012065 force\_merge 1 132 0
008076 force\_merge 1 94 0
010060 force\_merge 1 169 0
012074 force\_merge 1 148 0
012055 force\_merge 1 134 0
I wonder if there is a way to speed up the segment merging at night(0:00-7:00) everyday.
I tried to change the thread\_pool.force\_merge.size but it is not dynamically updateable.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [April 26, 2021, 10:20pm UTC](https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267/2 "2021-04-26T22:20:43Z")
The best way is to allocate more hardware resources for it, specifically faster disk.
There's no other magic switches here.
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### Author:  [@wangxr1985](https://discuss.elastic.co/u/wangxr1985)
#### Post date: [April 27, 2021, 3:22am UTC](https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267/3 "2021-04-27T03:22:16Z")
Can I set the thread\_pool.force\_merge.size of each warm data node to a value larger than 1 to speed up the forcemerge?
And can I do the I/O throttling in the daytime and disable it at night?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 25, 2021, 3:22am UTC](https://discuss.elastic.co/t/how-to-speed-up-the-segment-merging-at-night/271267/4 "2021-05-25T03:22:53Z")
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