# How to reduce IOWait on Wowza Linux Server by increasing Memory for Caching

**URL:** <https://community.wowza.com/t/how-to-reduce-iowait-on-wowza-linux-server-by-increasing-memory-for-caching/40954>\
**Category:** Wowza Streaming Engine\
**Created:** [September 12, 2014, 2:13am UTC](https://community.wowza.com/t/how-to-reduce-iowait-on-wowza-linux-server-by-increasing-memory-for-caching/40954 "2014-09-12T02:13:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Manh\_Hung\_Nguyen](https://avatars.discourse-cdn.com/v4/letter/m/c4cdca/32.png) [@Manh\_Hung\_Nguyen](https://community.wowza.com/u/Manh_Hung_Nguyen)\
**Post date:** [September 12, 2014, 2:13am UTC](https://community.wowza.com/t/how-to-reduce-iowait-on-wowza-linux-server-by-increasing-memory-for-caching/40954/1 "2014-09-12T02:13:15Z")

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Hi everyone,

I have a Wowza Server with 32 GB RAM. I set the heapsize is 10GB and I remain 22 GB.

May using memory based caching techniques reduce IOWait?

How can I configure Wowza to do that?

Thank you.

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**Author:** ![Paul\_Shields](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/paul_shields/32/390_2.png) [@Paul\_Shields](https://community.wowza.com/u/Paul_Shields)\
**Post date:** [September 22, 2014, 10:20am UTC](https://community.wowza.com/t/how-to-reduce-iowait-on-wowza-linux-server-by-increasing-memory-for-caching/40954/2 "2014-09-22T10:20:39Z")

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Hi.

iowait can occur for a variety of reasons. You can monitor it with iostat or iotop. Make sure your backend storage is as fast as possible to prevent any IO backlogs, and keep available capacity at 80% or under… If you’re using more than one server then yes something like [[https://www.wowza.com/docs/how-to-scale-video-on-demand-streaming-with-media-cache](https://www.wowza.com/docs/how-to-scale-video-on-demand-streaming-with-media-cache)]MediaCache may help.

Kind regards,

Paul