Creating items with data from userparameters?

[dissect]

Hi everyone

I think I over engineered something to such an extend that I can not get something done.

I would like to monitor the performance of our storage using iostat. I got that part working using the sample to discover Linux partitions and have the following output.
{
"data":[
{
"{#Device}":"sda”,
"{#DevTPS }":"1.2”,
"{#DevRPS}":"10.3”,
"{#DevWPS}":"0.02” }]}

So now I am stuck not being able to use the io data, which I am getting in zabbix?
For testing purposes I have created a normal text item and the data is coming through. Please help me see the light

[BDiE8VNy]

I believe you mixed a bit UserParameter with Low-Level-Discovery-Rules.

One way to achieve what I think you want to could be...
Create UserParameter like these:

# Key: custom.dev.discovery
# Result: [s|{"data":[{"{#DEVNAME}":"sda"}]}]
UserParameter=custom.dev.discovery,awk 'BEGIN{printf "{\"data\":["}$1~/[0-9]/{printf c"{\"{#DEVNAME}\":\""$NF"\"}";c=","}END{printf "]}"}' /proc/partitions

# Key: custom.iostat["sda",2]
# Result: [d|3232.03]
UserParameter=custom.iostat[*],iostat -d $1 | awk '$$1=="$1"{print $$(1+$2)}'

Then create a Low-Level-Discovery-Rule with the item key custom.dev.discovery.
Optionally add a regular expression to filter for the desired devices.

Within the discovery rule create the following item prototypes:
Item1
Name: {#DEVNAME} transactions per second
Key: custom.iostat["{#DEVNAME}",1]

Item2
Name: {#DEVNAME} blocks read per second
Key: custom.iostat["{#DEVNAME}",2]

Item3
Name: {#DEVNAME} blocks written per second
Key: custom.iostat["{#DEVNAME}",3]

This proposal is just to show the idea and is not tested in any case neither syntactically nor logically.