# pmm server got high iowait

**URL:** <https://forums.percona.com/t/pmm-server-got-high-iowait/6009>\
**Category:** PMM 1.x\
**Created:** [November 21, 2017, 3:43am UTC](https://forums.percona.com/t/pmm-server-got-high-iowait/6009 "2017-11-21T03:43:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Fan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/fan/32/40_2.png) [@Fan](https://forums.percona.com/u/Fan)\
**Post date:** [November 21, 2017, 3:43am UTC](https://forums.percona.com/t/pmm-server-got-high-iowait/6009/1 "2017-11-21T03:43:36Z")

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my english is poor,forgive me  
my pmm server hardware info:  
16cpu 64G mem  
Last Saturday and today I suddenly received a lot of warning emails like NO DATA . seems like that pmm can’t get data. so i login to the server and use top iostat iotop . i found that the io load is high ,see the pic,  
can anyone explain why?

![photoid=50132](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/6/6d71314a3c569f1b07a7a19ac793508a10b5861a.png)

![photoid=50133](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/9/9c23b5ff72a0d4fe1d4a635afde1a4f90a0df5c1.png)

 ![photoid=50134](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/6/679414f33c9092aaccbd2294dc6bb5171ec28065.png)

![photoid=50135](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/d/d93356089d9be0df9d0fd4789baa8f43473bdf1b.jpeg)

 ![photoid=50136](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/6/636d64ebb1d25ae40582c3bb2c2d6be2b2e3d266.jpeg)

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**Author:** ![Stateros](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/stateros/32/2490_2.png) [@Stateros](https://forums.percona.com/u/Stateros)\
**Post date:** [November 22, 2017, 10:09am UTC](https://forums.percona.com/t/pmm-server-got-high-iowait/6009/2 "2017-11-22T10:09:50Z")

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Have the same situation. Suddenly iowait grew up yesterday and still at the same high level.

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<div class="post-metadata">

**Author:** ![Fan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/fan/32/40_2.png) [@Fan](https://forums.percona.com/u/Fan)\
**Post date:** [November 22, 2017, 8:39pm UTC](https://forums.percona.com/t/pmm-server-got-high-iowait/6009/3 "2017-11-22T20:39:56Z")

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i forgot to say my pmm version is 1.3.0