Open Issues Scalable, distributed meta-data management and reconfiguration. Scalable log cleaning. Entry specifies a specific machine. Helps do load balancing. Have an order of magnitude more entries than managers.
Old managers send state to a new manager to distribute load.
Relatively small and slowly changing. Managers keep track of cache consistency information and disk block pointers. The IMap Maps a file ID to the disk address of the file's index node. The IMap points to index nodes which resemble FFS inodes. File Directories Maps file names to file IDs.