# I/O scheduler for ES 7.0

**URL:** <https://discuss.elastic.co/t/i-o-scheduler-for-es-7-0/223981>\
**Category:** Elasticsearch\
**Created:** [March 17, 2020, 6:27pm UTC](https://discuss.elastic.co/t/i-o-scheduler-for-es-7-0/223981 "2020-03-17T18:27:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pinakinab](https://avatars.discourse-cdn.com/v4/letter/p/bcef8e/32.png) [@pinakinab](https://discuss.elastic.co/u/pinakinab)\
**Post date:** [March 17, 2020, 6:27pm UTC](https://discuss.elastic.co/t/i-o-scheduler-for-es-7-0/223981/1 "2020-03-17T18:27:57Z")

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We are using ES 7.5.0 As per the [documentation](https://www.elastic.co/guide/en/elasticsearch/guide/current/hardware.html#id-1.10.4.5.5.4.2.1), selecting the correct i/o scheduler should optimize the ES performance. In our system when I checked in /sys/block/sdb/queue/scheduler, I could see 3 scheduler options

1. noop
2. deadline
3. cfq

We are using azure blockstorage in our system. So which scheduler should be best for our configuration?

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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:** [March 17, 2020, 8:29pm UTC](https://discuss.elastic.co/t/i-o-scheduler-for-es-7-0/223981/2 "2020-03-17T20:29:22Z")

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We used to recommend noop, but I don't know if that's still relevant. Hopefully someone else with more knowledge can comment 🙂

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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:** [April 14, 2020, 8:29pm UTC](https://discuss.elastic.co/t/i-o-scheduler-for-es-7-0/223981/3 "2020-04-14T20:29:29Z")

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