MRC and DIR store all (meta)data in
BabuDB, an embedded database optimized for file system metadata storage. The local directory on the MRC/DIR host in which the data resides is defined through the
babudb.baseDir and
babudb.logDir properties in the MRC/DIR configuration file, which point to
/var/lib/xtreemfs/{mrc|dir}/database and
/var/lib/xtreemfs/{mrc|dir}/db-log by default.
The OSD stores its data in the form of files and directories on the OSD's local file system. All objects reside in the
object_dir directory specified in the OSD configuration file, which points to
/var/lib/xtreemfs/objs by default.