The Nectar Research Cloud is used for a very broad spectrum of workloads, so we offer a range of flavor classes. A flavor defines the size of compute resources (number of virtual CPUs, memory and storage capacity) that can be assigned automatically to virtual machine instances in a cloud configuration.
Nectar flavors make it easier to support different user requirements and enable efficient use of the Nectar Cloud infrastructure.
Each flavor has an associated "cost" in Nectar Service Units (SU) per unit of time. For convenience, these are shown in the tables below as SU per hour and SU per year. The flavor costs correlate to the compute resources available to the flavor; e.g. the number and priority of the virtual CPUs and the amount of RAM. Other cost adjustments are applied for various reasons. For example, deprecated flavors have a relatively higher SU cost to encourage users to stop using them.
The SU costs for each flavor are subject to change.
The following standard flavor classes are currently offer on the Nectar Research Cloud:
- Tiny (t3)
- Balanced (m3)
- RAM Optimised (r3)
- CPU Optimised (c3)
- GPU Visualisation (g1) (reserved instances only)
- GPU Compute (g2) (reserved instances only)
- Huge RAM (h4) (reserved instances only)
- Huge RAM (h3)
General Availability flavors
The t3, m3, r3 and c3 flavors are available for use by all projects.
The Tiny (t3) flavors are a great choice for testing and prototyping or even just simple workloads with 1GB RAM per virtual CPU core available in 1, 2 and 4-core, with smaller 10GB root disks.
The Balanced (m3) flavors are suited to most workloads. Balanced (m3) flavors offer 2GB of RAM per VCPU. This ratio suits typical applications, and it allows efficient use of Nectar infrastructure. (If your applications need more memory, you can use the RAM optimised flavors; see below). All Standard (m3) have a 30GB root disk. The largest one provides 32 virtual CPUs and 64GB RAM.
RAM Optimised (r3)
For workloads that require more memory, the RAM Optimised (r3) flavors are recommended. They provide a ratio of 4GB of RAM for each VCPU. The root disk size is 30GB. The largest r3 flavor provides 32 virtual CPUs and 128GB RAM.
CPU Optimised (c3)
For workloads that use more CPU cycles there are the CPU Optimised (c3) flavors. These flavors are best suited to compute-intensive workloads. The CPU Optimised (c3) flavors go up to a maximum size of 32 virtual CPUs and 64GB RAM. The VCPUs are given a higher priority for CPU cycles on the physical server relative to other flavors.
For more information please see GPU flavours & reservation system.
Compute GPU (g2)
g2 instances come with Nvidia A100 GPUs
|Ephemeral Disk (GB)|
Visualisation GPU (g1)
g1 instances come with Nvidia A40 GPUs
Huge RAM (h4)
h4 instances are available in larger RAM sizes than h3 and also come with fast ephemeral disk
The following flavors are restricted in use. Access to these flavors needs to be requested through:
- The allocation system for h3 flavors
- Via a support request for the private flavors
- The allocation system, and then the GPU reservation system for GPU system flavours
Huge RAM (h3)
The Huge RAM flavors are available for applications and workloads that require a very large amount of RAM. The Huge RAM (h) flavors offer 7.5GB of RAM per VCPU core and start at 180GB RAM. The RAM consumed by the Huge RAM flavors is a very limited resource. Users will need to provide a strong technical justification on the allocation request form to be granted access to these flavors.
Nectar nodes may offer additional flavors to selected users. These private flavors and their details (including SU costs) are Nectar node specific. The flavors are frequently associated with hardware whose purchase was funded by or for a specific project. Access to private flavors may be requested via a Nectar Support ticket.