Availability Statistics

gbrance

I was looking to create some availability reports in the Orion Report writer. However I am noticing something odd. When I run the availabitiy report for this month in the Report Writer it shows one Node having 65.9% availability for this month. I selected the Availability-sort * and function average. However when I look in the website at the specific Node details it shows 88.4% availability for this month. What am I doing wrong when I am creating this report under Report Writer?

GB

Network_Guru

Hey GB,

This one's a real "Gotchya".
I've brought this issue up before, but I'm not sure if it will get fixed.
It's all dependant on your DB maintenance settings & how long you keep the detailed polling data.

Average %uptime is based on failed polls to the total number of polls. If you poll every 10 minutes then you have 6 polls/hour x 24 hrs/day x 30 days = 4,320 polls. Assumming you lose 432 polls, Average availability = 90%.

Now let's assume you roll up your detailed stats into hourly stats after 14 days.
If the outage occured with the last 14 days then the avg avail. is based on this formula:

6 polls/hour x 24 hrs/day x 14 days + 1 avgd. poll/hour x 24 hours x 16days = 2400 polls
432/2400x100 = 18% outage or 82% uptime.

Assumimg the outages occurred more than 14 days ago then:

432 outage polls every 10 minutes averages into 72 outage polls hourly after 14 days.

72/2400x100 = 3% outage or 97% uptime.

As you can see - this is a significant difference!

Also see this post:

www2.solarwinds.net/.../topic.asp

You could base the report on the actual outage minutes per month as per this post:

www2.solarwinds.net/.../topic.asp


-=Cheers=-
NG