What do servers in high-performance computing clusters primarily share?

In high-performance computing (HPC) clusters, servers primarily share resources such as compute power, storage, and memory to perform large-scale calculations more efficiently. Among the options provided, the availability zone is the most relevant choice.

Availability zones refer to distinct locations within a data center or across multiple data centers within a cloud environment that are used to reduce the risk of localized failures. They provide redundancy and high availability for applications running on multiple servers. In the context of HPC clusters, while they may span multiple availability zones for resilience and fault tolerance, the focus remains on resource sharing among the compute nodes to execute parallel tasks effectively.

The other choices do not accurately represent what is primarily shared among servers in HPC clusters. Identity groups pertain more to user and permission management rather than resource sharing. Group cache is about temporary storage for improving efficiency but is not a primary focus in the core functioning of HPC. Virtual machine migration, while relevant in cloud and virtualization contexts, is not a fundamental aspect of HPC resource sharing, which is concerned more with maximizing computational capabilities rather than moving virtual machines between servers.