# Slow I/O on one node during bulk indexing

**URL:** <https://discuss.elastic.co/t/slow-i-o-on-one-node-during-bulk-indexing/15013>\
**Category:** Elasticsearch\
**Created:** [December 24, 2013, 2:59pm UTC](https://discuss.elastic.co/t/slow-i-o-on-one-node-during-bulk-indexing/15013 "2013-12-24T14:59:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![search](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@search](https://discuss.elastic.co/u/search)\
**Post date:** [December 24, 2013, 2:59pm UTC](https://discuss.elastic.co/t/slow-i-o-on-one-node-during-bulk-indexing/15013/1 "2013-12-24T14:59:00Z")

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During Bulk indexing, HQ is showing the following for one of the nodes in  
my cluster (20nodes in my cluster). While every node has the value around  
3000, this one node has value around 13000. Can some one Please explain  
what this means and what should be the ideal value for this and there are  
any settings to tune to control this?

High values indicate slow I/O.  
Keys: stats.indices.flush.total\_time\_in\_millis / stats.indices.flush.  
total  
Value: 65485927 / 5037 = 13000.97816160413  
Thresholds:  
13000.97816160413 \<= 750 = Pass!  
13000.97816160413 \<= 1500 = Warning!

Thank you.

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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:** [July 6, 2017, 1:59am UTC](https://discuss.elastic.co/t/slow-i-o-on-one-node-during-bulk-indexing/15013/2 "2017-07-06T01:59:29Z")

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Closed on July 6, 2017, 1:59am UTC