New item based on snmp items

[oct]

Hello

I need to monitor % of used disk space of several servers using SNMP. I created two new items, one using the hrStorageSize (.1.3.6.1.2.1.25.2.3.1.5.1) and another on using htStorageUsed (.1.3.6.1.2.1.25.2.3.1.6.1). Both MIB's are included into de host-resources mib file. My question is, if it is possible to create a 3rd item that records de following: (hrStorageUsed/hrStorageSize)*100
This could be useful also to monitor other percentages.

Another question i how is the best way to monitor if a node is down? I have created a Linlkdown item to monitor ifOperStatus MIB (1=up, 2=down), but if the node is disconnected I don't receive this value, so I'd like to monitor if the node is down from the Zabbix server or the zabbix proxies.

Thanks

Oct

[alixen]

Hi,

I need to monitor % of used disk space of several servers using SNMP. I created two new items, one using the hrStorageSize (.1.3.6.1.2.1.25.2.3.1.5.1) and another on using htStorageUsed (.1.3.6.1.2.1.25.2.3.1.6.1). Both MIB's are included into de host-resources mib file. My question is, if it is possible to create a 3rd item that records de following: (hrStorageUsed/hrStorageSize)*100
This could be useful also to monitor other percentages.

Calculated items have been introduced in version 1.8.1.
It seems to be exactly what you are looking for
Check the documentation : http://www.zabbix.com/documentation/...lculated_items
A memory leak has been found in this function (https://support.zabbix.com/browse/ZBX-2051). Be sure to use latest nightly build or wait for 1.8.2 before using it in production.

Another question i how is the best way to monitor if a node is down? I have created a Linlkdown item to monitor ifOperStatus MIB (1=up, 2=down), but if the node is disconnected I don't receive this value, so I'd like to monitor if the node is down from the Zabbix server or the zabbix proxies.
Oct

If you don't receive anything, you can use nodata function in trigger expression to check it.

Regards,
Alixen

[oct]

Hi,



Calculated items have been introduced in version 1.8.1.
It seems to be exactly what you are looking for
Check the documentation : http://www.zabbix.com/documentation/...lculated_items
A memory leak has been found in this function (https://support.zabbix.com/browse/ZBX-2051). Be sure to use latest nightly build or wait for 1.8.2 before using it in production.

It sounds promising. I'll give it a try. All the examples are refered to Zabbix agent parameters. Do you know if calculated items will work with snmp items?

If you don't receive anything, you can use nodata function in trigger expression to check it.

Regards,
Alixen

I already use the nodata expression. The problem is that if I monitor a host with multiple interfaces (i.e. a router), an interface can be down but still receive data for that interface. So I created a new trigger depending of two items, the "nodata" expression OR the linkdown SNMP OID. I'm still testing this configuration.

Also, I managed to work icmpping external check. This is a good way for what I need. The problem I found is that, on a distributed environment (one main station, one proxy), all nodes monitored by the proxy report icmmping down. It seems that external checks are made by the central monitoring station, not the proxy. Does anybody know if it should work?

Thanks

Oct

[alixen]

It sounds promising. I'll give it a try. All the examples are refered to Zabbix agent parameters. Do you know if calculated items will work with snmp items?

Yes, they work with SNMP items (I think that they work with any kind of item).
I have just created a simple one that calculate ifInOctets+ifOutOctets on one interface:
ifInOutOctets1 = last(ifInOctets1)+last(ifOutOctets1)
and it works.

Regards,
Alixen

[oct]

Today I tried to upgrade to 1.8.1. I didn't find clear information on how to do that. Anyway, I downloaded the sources, compiled them and installed following the installation guide. I don't know what means "update front-end PHP files" (I'm a newbie). Am I missing something?

I still can't create calculated items. Given a host, if I try to add a new item, I can't see the type "calculated" in the drop down list. Do I have to do some more steps?

Thanks

Oct

[oct]

Well, I soved my issue. I found I hade to copy the frontend folder from sources to /home/zabbix/public_html. Now I'm running Zabbix 1.8.1 with working calulated items. Also, I solved the icmpping behind a proxy problem.

Thanks for your help, Alixen