# Issuer with tthe size of innodb buffer pool in cacti

**URL:** <https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762>\
**Category:** Percona Monitoring Plugins\
**Created:** [September 23, 2014, 12:35am UTC](https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762 "2014-09-23T00:35:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![saidassoumani](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@saidassoumani](https://forums.percona.com/u/saidassoumani)\
**Post date:** [September 23, 2014, 12:35am UTC](https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762/1 "2014-09-23T00:35:38Z")

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Hi everbody ,  
I have an issue , i don’t understand why in cacti for the graph innodb buffer pool size , I have 81.2k  
but in my server the size is 1300Mo

Someone can help me to understand please ?

![photoid=22861|attachment](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/7/79d283ce6e89f3c1ccd831ef78e762157dc9b0fb.jpeg)

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**Author:** ![scott.nemes](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/scott.nemes/32/5_2.png) [@scott.nemes](https://forums.percona.com/u/scott.nemes)\
**Post date:** [September 23, 2014, 10:41am UTC](https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762/2 "2014-09-23T10:41:58Z")

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Hi saidassoumani;

The graph is showing you pages, not megabytes.

I believe 1024 pages is typically 16 megabytes, so: 81,200 pages / 1024 = 79 \* 16 megabytes = ~1269 megabytes (approximate).

So based on your chart, you are barely using any of your allocated InnoDB buffer pool.

-Scott

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**Author:** ![saidassoumani](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@saidassoumani](https://forums.percona.com/u/saidassoumani)\
**Post date:** [September 24, 2014, 12:06am UTC](https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762/3 "2014-09-24T00:06:08Z")

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Hi @scotte.nemes  
first , thank you for your reply.

Huuum , this means that all the data I need are stored buffer pool and there are no I/O disk ?  
( I have only innodb table !)

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<div class="post-metadata">

**Author:** ![scott.nemes](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/scott.nemes/32/5_2.png) [@scott.nemes](https://forums.percona.com/u/scott.nemes)\
**Post date:** [September 24, 2014, 9:58am UTC](https://forums.percona.com/t/issuer-with-tthe-size-of-innodb-buffer-pool-in-cacti/3762/4 "2014-09-24T09:58:50Z")

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Hi saidassoumani;

There would still be disk I/O for initial reads before data gets into the buffer pool, plus various other things MySQL does, but in general yes you have a large enough buffer pool to store your accessed InnoDB data currently, which would reduce the disk I/O. You could even reduce the buffer pool size at this point if you need the memory back, otherwise you can leave it as-is and have room to grow. =)

-Scott