# Linux Monitoring Plugin -  "NaN value for Used Memory"

**URL:** <https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374>\
**Category:** Percona Monitoring Plugins\
**Created:** [August 31, 2015, 12:37am UTC](https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374 "2015-08-31T00:37:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gugansankar](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/gugansankar/32/1081_2.png) [@gugansankar](https://forums.percona.com/u/gugansankar)\
**Post date:** [August 31, 2015, 12:37am UTC](https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374/1 "2015-08-31T00:37:10Z")

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I have installed Percona monitoring plugin into my cacti server and running without any issue. Only problem is with “used Memory” Value that shown as “NaN”.

My Server Memory limit " 72G" . When I run the script manually, it shows negative value for hu option. I think, that is the problem.

[root@Monitoring-Srv ~]# /usr/bin/php -q /usr/share/cacti/scripts/ss\_get\_by\_ssh.php --host 172.20.1.10 --type memory --items hq,hr,hs,ht,hu,hv  
hq:2990836121 hr:2377703424 hs:7340761088 ht:1242996736 hu:-5231743385 hv:7601856921  
[root@Monitoring-Srv ~]#

I run the same script towards on one of my low memory capacity server [8 GB]. it shows all the value correctly.

[root@Monitoring-Srv ~]#/usr/bin/php -q /usr/share/cacti/scripts/ss\_get\_by\_ssh.php --host localhost --type memory --items hq,hr,hs,ht,hu,hv  
hq:2255319040 hr:157446144 hs:139264 ht:153554944 hu:5654937600 hv:8221396992  
[root@Monitoring-Srv ~]#

Is there any max limit enabled in Memory plugin to show the value ?.

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<div class="post-metadata">

**Author:** ![gugansankar](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/gugansankar/32/1081_2.png) [@gugansankar](https://forums.percona.com/u/gugansankar)\
**Post date:** [August 31, 2015, 4:24am UTC](https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374/2 "2015-08-31T04:24:21Z")

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Any idea ?

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<div class="post-metadata">

**Author:** ![gugansankar](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/gugansankar/32/1081_2.png) [@gugansankar](https://forums.percona.com/u/gugansankar)\
**Post date:** [September 1, 2015, 11:54pm UTC](https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374/3 "2015-09-01T23:54:16Z")

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No one had hit with this issue ?. Pls someone give advice on this. whether I have to make any changes on the php script file.

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<div class="post-metadata">

**Author:** ![gugansankar](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/gugansankar/32/1081_2.png) [@gugansankar](https://forums.percona.com/u/gugansankar)\
**Post date:** [September 8, 2015, 5:06am UTC](https://forums.percona.com/t/linux-monitoring-plugin-nan-value-for-used-memory/4374/4 "2015-09-08T05:06:13Z")

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Can anyone please suggest , how to make the Used Memory value get plotted in cacti ?.