How to calculate Network availability (with example)
In today’s article , we will learn about how to calculate network availability in general with an detailed example to digest the problem bit better .
These type of questions may appear in storage , data center related certifications and one of the most renowned is Dell EMC Information and Storage Management certification (ISM).
What is Network Availability?
The network availability is the average percentage of time during the network performed its intended function.
Well in layman’s terms, average number of hours/days/months network was up and running.
Now, How to calculate Network availability, we will try understand this with below example.
Question :
A Fibre Channel switch has eight ports and all ports must be operational 24x7. However, a failure of Port
5 occurs on a particular week as follows:
• Monday = 11 AM to 12 PM
• Thursday = 7 AM to 11 AM
• Saturday = 11 AM to 1 PM
What is the availability of Port 5 in that week?
Explanation :
We have the formula ,
Network availability = uptime / totaltime
where , totaltime= downtime + uptime
So from the given data , Downtime :
For Monday :1 Hr
For Thursday : 4 Hr
For Satursday : 2 Hr
total downtime = 1 + 4+2 =7Hr
Now, Uptime:
For the Monday : 24 hrs — 1 hr = 23Hr
similarly for Thursday : 20 Hr
For Saturday : 22 Hr
So, total uptime = 23+20+22 + 96= 161 Hrs
Reason for 96 Hrs : notice that according to the data no downtime was mentioned on the other 4 days of the week, so we consider all 24 Hrs of a day as uptime only.
totaltime will be : 7 Hr + 161 Hr = 168 Hrs
Using the formula from above ,
Network availability = 161/ 168 = 95.8%
Hope you guys have learned something today and may all your time be UPTIME !!!!
I will continue to write more articles related to storage, data protection etc.
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Edit 1: calculations :)
