Release note for CHFS/Cache 3.0.0 (2023/9/11)

CHFS/Cache is a parallel caching file system for node-local storages based on CHFS ad hoc parallel file system. It provides a caching mechanism against a backend parallel file system. Files in the backend parallel file system are automatically cached. Output files are automatically flushed.

How to create file system

   % eval `chfsctl [-h hostfile] [-p verbs] [-D] [-c /dev/dax0.0] [-b /back/end/path] [-m /mount/point] start`

The backend directory typically in a parallel file system can be specified by the -b option. Files in the backend directory can be transparently accessed by CHFS. For efficient access, files can be staged-in by chstagein command beforehand. The output files will be flushed automatically to the backend directory. It is possible to ensure flushing all dirty files by chfs_sync() or chfsctl stop.

Technical details

Osamu Tatebe, Hiroki Ohtsuji, "Caching Support for CHFS Node-local Persistent Memory File System", Proceedings of 3rd Workshop on Extreme-Scale Storage and Analysis (ESSA 2022), pp.1103-1110, 2022