ABSTRACT: Perlmutter is the newest supercomputer at Berkeley Lab, California, and features a whopping 35 PB all-flash Lustre file system. Let's dive into its architecture, showing some early performance figures and unique performance considerations, using low-level Lustre tests that achieve over 90% of the theoretical bandwidth of the SSDs, to showcase how Perlmutter achieves the performance of a burst buffer and the resilience of a scratch file system. Lastly, some performance considerations unique to an all-flash Lustre file system, along with tips on how better I/O patterns can make the most of such powerful architectures. BIO: Alberto Chiusole studied Data Science and Scientific Computing in Trieste when he had the opportunity to spend some months at CERN, in Geneva, benchmarking their Ceph file system against a classic Lustre file system from eXact lab, the HPC consulting company in Trieste he was working for at the time. After Trieste, he worked as a Storage and I/O Software Engineer at Berkeley Lab, California, a national scientific laboratory, where he assisted scientists with improving their I/O and data needs. He now works for Seqera Labs as an HPC DevOps Engineer, focusing on infrastructure support.