Upgrading to higher Ethernet speeds (e.g., 400GbE) with appropriate transceivers and fiber significantly increases bandwidth for inter-server communication. Implementing InfiniBand, a technology designed for high-performance computing interconnects, offers even better performance than Ethernet. Cat8 cables improve Ethernet signal quality but don't fundamentally increase bandwidth. Reducing batch size reduces the amount of data transferred but might impact training convergence. While AOCs can improve signal quality, they don't address the underlying bandwidth limitations as effectively as faster Ethernet or InfiniBand.

In most modern systems, network interfaces are automatically configured using DHCP. Therefore, the first step is to check if the DHCP client is enabled and configured correctly. If DHCP fails, then other troubleshooting steps, such as static IP assignment or driver reinstallation, can be considered.

MIG allows partitioning a single GPU into multiple isolated instances, thus optimizing resource utilization (A). It provides hardware- level isolation, ensuring performance consistency and preventing interference between workloads (B). While MIG simplifies GPU sharing, it doesn't eliminate the need for all virtualization software, especially in more complex environments. MIG doesn't increase FLOPS (D); it divides the existing compute power. While different containers running on different MIG instances could have different CUDA versions, MIG itself doesn't directly handle this (E); this is handled via containers or environments.

Network congestion (A) can directly impact the data transfer rate between the slower nodes and the storage. IJneven data distribution (B) means some storage nodes are more heavily loaded, leading to slower response times for nodes accessing data on those overloaded nodes. Insufficient RAM (D) limits the amount of data that can be cached locally, forcing more frequent reads from the slower storage system. CPU architecture (C) primarily affects compute performance, not 1/0. The speed of /tmp (E) is relevant if the training job uses local storage extensively for temporary files, but the question focuses on reading training data from the shared file system.

InfiniBand is designed for high-performance computing and offers significantly lower latency and higher bandwidth compared to Ethernet or Fibre Channel, making it the most suitable choice for demanding workloads like recommendation systems. While 100 Gigabit Ethernet provides high bandwidth, InfiniBand generally offers lower latency.