The purpose of the MPI I/O Working Group is to discuss and implement the changes and new features related to I/O operations, including operations on files, and also looking toward storing data in object stores.
The chairs of the working group are Quincey Koziol, Suren Byna, Jean-Luca Bez, Edgar Gabriel, and Jannek Squar.
https://lists.mpi-forum.org/mailman/listinfo/mpiwg-io is our public email list. Meeting topics and other updates will be sent to the mailing list, but most discussions occur on the MPI Forum's Slack workspace (https://mpi-forum.slack.com/) in the #wg-io channel.
The primary location for topics under consideration is the io-issues repository (https://github.com/mpiwg-io/io-issues) and meeting info and notes are stored in the wiki for that repository (https://github.com/mpiwg-io/io-issues/wiki).