Resource consumption for each environment is charged to the account owner on an hourly basis.
RAM & CPU #
RAM & CPU are measured in a CirrusGrid resource unit called a Cloudlet. A Cloudlet is roughly equivalent to 128 MiB RAM and 400MHz CPU.
Resources are charged on an hourly basis:
- RAM usage: the peak RAM usage over the hour
- CPU usage: the average CPU usage over the hour
When calculating your cloudlet usage, we only consider the larger of RAM or CPU usage each hour (not both combined). E.g. if during one hour your average CPU usage is 2400MHz (6 cloudlets), and your peak RAM usage is 1024MiB (8 cloudlets), you pay for 8 cloudlets – not the combined total (14 cloudlets).
There are two types of cloudlets: reserved and dynamic.
Reserved cloudlets are reserved in advance (using the topology wizard).
Dynamic cloudlets are scaled dynamically for your application.
The following resources are charged at some hosting providers, but others include a free amount.
Disk Space #
Disk Space usage is measured in GB. Like all CirrusGrid resources, you only pay for your actual consumption (you do not need to buy extra space “just in case” you need it). More details about charging disk space can be found in the Pricing system and Automatic Discounts documents.
Traffic usage is measured in GB. Only external traffic (between your environment and the Internet) is charged. Internal traffic (within your environment, or between environments at the same hosting provider) is absolutely free. More details about charging traffic can be found in the Pricing system and Automatic Discounts documents.
Optional Extras #
With CirrusGrid you can add the following optional services to your environment:
Public IPv4 is an external IP address which is directly accessible from outside of the cluster. This allows you to form direct connections between the Internet and specific servers within your environment. Otherwise (without buying a Public IPv4 address), traffic is routed from the Internet to your environment via the CirrusGrid traffic resolver.
CirrusGrid SSL is a protocol which establishes a secure connection between your client and your CirrusGrid environment (some hosting providers offer this service free of charge).