HP Matrix 7.2 KVM Private Cloud Getting Started Guide

issues so providing additional memory in your cloud can help performance. In this example, there
is little reason to put more than 1200 GB in this cloud.
Calculate the disk space required
Assume the total disk space needed by the VMs is 36 TB. Dividing by our oversubscription ratio
of 1:1.5, we need a minimum of 24 TB of physical disk space on the compute nodes.
Calculate the number of servers required
The numbers that were calculated above (88 cores, 800 GB of RAM and 24 TB of disk space)
define the minimum required compute resources needed in the private cloud. For ease of planning,
identical servers should be used to provide a private cloud.
If you decided to order a server with 16 cores, 96 GB of RAM and 4 TB of disk space, you must
divide each resource amount by the corresponding size in the target server to find the number of
servers to purchase. This is demonstrated below:
• 88 cores/16 cores per server indicates that you need at least six servers for CPU requirements.
• 800 GB/96GB per server indicates that you need at least nine servers to meet memory needs.
• 24 TB/4 TB indicates that you need six servers to meet minimum disk space requirements.
After analyzing this data, consider the following options:
• Purchase six servers, but add additional RAM to each server
• Purchase nine servers and have extra CPU and disk capacity.
22 Plan an expansion of the cloud