Tutorial: Using FSx for Lustre for storage cache

Based on explanation from storage specialist: use S3 for storage and FSxL for high speed transfer of data to load models from S3 to GPU.

Start by locating the repository's tutorial or documentation entry point and review the AWS storage options involved. Define the workflow for using S3 as storage and FSx for Lustre as a high-speed cache for loading models to GPUs; done means the tutorial clearly explains and demonstrates that workflow.

Written by the indexing model from the issue text.