# Shard size not even for the same index
**URL:** https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761
**Category:** Elasticsearch
**Created:** [August 29, 2021, 6:54pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761 "2021-08-29T18:54:23Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@junhuangli](https://discuss.elastic.co/u/junhuangli)
#### Post date: [August 29, 2021, 6:54pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/1 "2021-08-29T18:54:23Z")
One of our index is relatively big and I just found its shards size are not even, see below.
Any idea what could have cause this?
Will it cause any perf issues and anything I can do?
|my-index|0|r|STARTED|23869700|9.1gb|123.123.104.233|es-data-25|
|my-index|0|p|STARTED|23864279|4.6gb|123.123.104.153|es-data-10|
|my-index|0|r|STARTED|23854902|10.3gb|123.123.113.49|es-data-35|
|my-index|2|p|STARTED|303340414|70.2gb|123.123.97.11|es-data-45|
|my-index|2|r|STARTED|302962931|62.1gb|123.123.108.156|es-data-7|
|my-index|2|r|STARTED|302694814|71.3gb|123.123.103.221|es-data-18|
|my-index|5|r|STARTED|23856194|11.2gb|123.123.114.221|es-data-20|
|my-index|5|p|STARTED|23852768|9.3gb|123.123.99.102|es-data-12|
|my-index|5|r|STARTED|23854955|4.6gb|123.123.102.23|es-data-33|
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [August 29, 2021, 7:19pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/2 "2021-08-29T19:19:06Z")
Are you using custom document routing? Is the index using parent-child relationships?
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### Author:  [@junhuangli](https://discuss.elastic.co/u/junhuangli)
#### Post date: [August 29, 2021, 8:04pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/3 "2021-08-29T20:04:48Z")
Thanks for the hint @Christian_Dahlqvist
I didn't find any routing config in the mapping of the index. How can I check for parent-child relationships?
Btw, we deleted a lot of documents in this index recently. This unbalance happened after that.
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [August 29, 2021, 8:13pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/4 "2021-08-29T20:13:40Z")
Then it may be that the shards are in different stages of merging so a lot of the deleted documents may not have been m,erged out yet for some shards. You can manually run a forcemerge and see if that reduces the size but that can be I/O intensive.
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### Author:  [@junhuangli](https://discuss.elastic.co/u/junhuangli)
#### Post date: [August 30, 2021, 3:59pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/5 "2021-08-30T15:59:44Z")
Seems like forcemerge have worked, thanks @Christian_Dahlqvist
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 27, 2021, 3:59pm UTC](https://discuss.elastic.co/t/shard-size-not-even-for-the-same-index/282761/6 "2021-09-27T15:59:55Z")
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