SLA calculation on IT Services

[ariatti]

How it's calculated the values of SLA in IT services?

Example:

- Service 1
--- Trigger 1
--- Trigger 2

If the SLA of Trigger 1 was 0.02 and the SLA of Trigger 2 was 0.04

The SLA of parent service (Service 1) should be 0:06?

Thank's in advance!

Sorry by my english...

[ariatti]

anyone can help me on this?

[ariatti]

Any zabbix expert can answer me this?

[linuxgurugamer]

It should be the lower of the two

[ariatti]

But it is not. There is some kind of calculation that I did not understand what is...

[dissect]

I know this is a very late reply but to help others understand.

You cannot add 2 SLAs to each other. The best way to think of this is what happens when both SLAs reach 100%? You cannot violate an SLA by 200%.

So instead Service 1 is an average of Trigger1 & Trigger2

So to use your example: Trigger 1 = 0.02 and Trigger 2 = 0.04
Makes: Service 1 = 0.03%

You calculation would be: =(0.02+0.04)/2

[m_gularte]

Hmm...

I'm not sure... I made a test one day and the result was:
Service 1 = 0.04%

It takes the highest value. Although, from what I noticed, the results can be different depending on the version in use. For example, if a trigger is in state unknown, old zabbix versions calculate that as downtime. Nowadays, unknown state it's not used in sla math (apparently).

But, as i said... i'm not sure, i've been doing these tests in 1.8.12, 1.8.14, 2.0, 2.0.1 and 2.0.2, i don't remember anymore. Is like that question about "Use custom multiplier", some people say that the default value keep changing from version to version, there are topics about this issue...