Calculating Redundancy Ratio from Minimal Level of Redundancy

Appendix C: Capacity Planning : vCloud Administrator (Service Provider) Perspective : Calculating Redundancy Ratio from Minimal Level of Redundancy

For example, the level of redundancy is calculated below for a cluster size of ten nodes containing two redundant nodes.

After the ratio of redundancy is calculated, the number of units of consumption per provider virtual datacenter can be determined using the following equation:

CPU Resources per Cluster

For the example where:

This results in:

The number of memory units of consumption is calculated in the following equation.

For the example where:

This results in:

Based on the calculations, the example provider virtual datacenter has 122.88GHz of available CPU and 409.6GB of available memory, taking a vSphere cluster redundancy of N+2 into account. The next section provides guidance for capacity management as it applies to each of the consumption models.