Rackspace Flex Cloud: Instance Flavors

Last Updated: 1/31/25

Compute Instance Flavors

When creating an instance (VM) in the Rackspace Flex Cloud, it's important to know you're choosing the right flavor for the job. The table and information provided below will provide all the information available about available flavors.

Naming Conventions

Our flavors follow a simple to understand flow which lets a user better understand what they're getting at a glance.

NAME.GENERATION.CPU.MEMORY

• Name: The identifier or name of the flavor, which usually includes information about its resource allocation, such as the amount of RAM, disk space, and the number of vCPUs. It's a unique label for a specific VM configuration.
• Generation: The generation slot is an integer that starts at 0. Within the Rackspace OpenStack this value is tied to the hardware generation being supported by the flavor itself.
• RAM (MB): The amount of memory (RAM) allocated to the virtual machine, measured in megabytes (MB). This determines how much data the VM can store in memory for processing tasks.
• Disk (GB): The size of the disk allocated to the virtual machine, measured in gigabytes (GB). This is typically the storage space available for the operating system, applications, and data.
• Ephemeral (GB): This refers to the ephemeral disk, a temporary storage space that is often used for temporary data. Measured in gigabytes (GB).The data on an ephemeral disk is lost when the instance is stopped, migrated, or terminated and is not captured in Instance Snapshots.
• VCPUs: The number of virtual CPUs assigned to the virtual machine. It represents the compute power or processing capacity available to the VM, with each vCPU corresponding to a thread of execution on a physical CPU core.
• Flavor Type: Indicates the purpose or optimization of the flavor. Common types include:
  • General Purpose: A balanced configuration suitable for most workloads.
    Memory Optimized: Designed with more RAM, ideal for memory-intensive tasks (e.g., databases, big data processing).

Additional Documentation:

Flavor Naming