Disk Space Calculator?

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One of the many things I deal with is monitoring servers.

Those familiar with these tools will know about thresholds.  Typically disk thresholds are normally percentages of free space.

So to keep those thresholds happy we need to manage the disk space.

This leaves a question.  How much do you extend your disk by to satisfy the thresholds?

Here is a formula:

X=(((A-B)/(100-C)*100)-A

Where:

X = Space needed to add (GB)
A = Current disk size (GB)
B = Current free space (GB)
C = Threshold limit (%)

As an example:

A 140GB disk blows the 10% threshold in Operations Manager, lets say the disk has 14GB free so you need to add some space to take it to 15% to satisfy the threshold with some head room.

A = 140
B = 14
C = 15

X = (((140-14)/(100-15)*100)-140
X = ((126/85) * 100) - 140
X = 148.23 - 140
X = 8.23

So an increase of 8.23GB would yield 15% free space.

Hope that helps.

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