Can I use optics?
While optical networking is possible with immersion, it does require some specialized components to work reliably. Some immersion enthusiasts and newer providers claim that you can use any standard fiber optic cable/connector in an immersion environment. However, we have found that to not be factual and/or a reliable way to deal with fiber optics in immersion.
Optical networking is based on the refraction of light through mediums of varying refractive indices (air, fiber cables, connectors, etc.) when a liquid fills a space that was designed to be an air gap, it changes the refractive index and can cause signal loss. In a static environment this could be resolved by optimizing the refractive index of the liquid. In a dynamic environment, however, such as an Immersion Cooling rack, the flow of the liquid, the variation in its density (due to temperature variation) that causes a change in the refractive index of the coolant, and the possibility of bubbles getting trapped in the miniscule gaps can all cause issues with signal reliability.
In addition, materials used in the optical transceivers may not be suitable for operation in immersion fluids. This may result in discoloration, which in turn has an effect on the light signal which travels through these materials.
Hence, both GRC and Asperitas recommend using specialized optical cables and connectors that deliver a much more reliable connection and signal stability.
Can I use standard hardware?
From a user perspective you are making a tremendous investment in IT hardware, which should be taken seriously and treated with care. Standard hardware that was originally designed for air cooling can be optimized for immersion. This consists of removing components such as fans that have no use in immersion, and replacing materials such as thermal paste with materials that have better performance and longevity in fluids. Both GRC and Asperitas are working closely with leading OEMs to provide immersion ready servers that may be optimized for immersion or specifically designed to exploit the higher thermal capacity and improved reliability offered by immersion.
Does it mean all the components are different?
No. Standard components – from motherboards, PSUs, memory, storage and CPUs to GPUs can be used. Saying this, GRC and Asperitas use various optimized components to increase lifespan and performance.
Can I use Immersion Cooling for storage, networking and compute?
Yes, you can. Both GRC and Asperitas have a track record in delivery a range of systems including all components.
How about warranty on hardware and components, will it remain?
Several OEMs offer standard warranty and both GRC and Asperitas are working closely with system integrators and OEMs to offer you warranty models meeting your expectations.
Can I service IT hardware which has been immersed?
Yes, you can. Components can be replaced, and GRC and Asperitas are offering different approaches to do so. The horizontal, open rack design allows easy access to each immersed server individually.