Copy your data directory somewhere safe (default path: /var/lib/mfs).
Files you should be interested in keeping are primarily:
• metadata.mfs – your metadata set in binary form. This file is updated hourly + on master server shutdown. You can also trigger a metadata dump with lizardfs-admin save-metadata HOST PORT, but an admin password needs to be set in the mfsmater.cfg first.
• sessions.mfs – additional information on user sessions.
• changelog*.mfs – changes to metadata that weren’t dumped to metadata.mfs yet.
