# three mysql instances are monitored,but the buffer pool size of total ram has no data

**URL:** <https://forums.percona.com/t/three-mysql-instances-are-monitored-but-the-buffer-pool-size-of-total-ram-has-no-data/6659>\
**Category:** PMM 1.x\
**Created:** [October 30, 2018, 8:30pm UTC](https://forums.percona.com/t/three-mysql-instances-are-monitored-but-the-buffer-pool-size-of-total-ram-has-no-data/6659 "2018-10-30T20:30:58Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![liangyu5017](https://avatars.discourse-cdn.com/v4/letter/l/82dd89/32.png) [@liangyu5017](https://forums.percona.com/u/liangyu5017)\
**Post date:** [October 30, 2018, 8:30pm UTC](https://forums.percona.com/t/three-mysql-instances-are-monitored-but-the-buffer-pool-size-of-total-ram-has-no-data/6659/1 "2018-10-30T20:30:58Z")

</div>

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[TR]  
[TD]I monitored multiple mysql instances on one server:

```
		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3308

		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3309

		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3310

		And add Linux :metric

		PMM - admin add Linux: metric 1.1.1.1

		Now there is no data in the buffer pool size of total ram in the mysql overview of the monitoring interface. Does the mysql instance 1.1.1.1-3308 need to read the data of Linux :metric 1.1.1.1-3308? But what I added is the data of Linux :metric 1.1.1.1?

		I tried to add more Linux :metric X.X.X.X, but the system could only add one.How can you make buffer pool size of total ram of multiple instances display data normally[/TD]
	[/TR]

```

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