Sum used disk space

[jordibrand]

Is it possible to create an item something like this?
sum("vfs.fs.size[D:,used]")&last("vfs.fs.size[E:,used]")&last("vfs.fs.size[F:,used]")?
I want to calculate the used disk space on multiple partition (e.g. D + E + F)

[coreychristian]

You will want to use a calculated item for that.

Check our example 3.

[jordibrand]

If I look at example 3, I don't know why mine isn't working.

Example 3
Calculating total bandwidth on eth0.

Sum of two functions:
last("net.if.in[eth0,bytes]")+last("net.if.out[eth0,bytes]")

So I think the following item is OK:
last("vfs.fs.size[D:,used]")+last("vfs.fs.size[E:,used]")+last("vfs.fs.size[F:,used]")
Type: Zabbix agent
Type of information: Numeric (unsigned)
Data type: Decimal

I get the error: Incorrect key: "Invalid item key format.".

Don't know what is wrong?

[coreychristian]

The Item Type should be 'Calculated' not 'Zabbix Agent'

[jordibrand]

Thank you, it's working now!
Last question, is het possible to export it to xml, xlsx or csv? I now have a summary of all disk sizes on the tab Monitoring -> Overview and then I select Application: Data (where the items are) and Type: Data