Appendix D. Ceph File System client configuration reference This section lists configuration options for Ceph File System (CephFS) FUSE clients. Set them in the Ceph configuration file under the [client] section. client_acl_type Description Set the ACL type. Currently, only possible value is posix_acl to enable POSIX ACL, or an empty string. This option only takes effect when the fuse_default_permissions is set to false . Type String Default "" (no ACL enforcement) client_cache_mid Description Set the client cache midpoint. The midpoint splits the least recently used lists into a hot and warm list. Type Float Default 0.75 client_cache size Description Set the number of inodes that the client keeps in the metadata cache. Type Integer Default 16384 (16 MB) client_caps_release_delay Description Set the delay between capability releases in seconds. The delay sets how many seconds a client waits to release capabilities that it no longer needs in case the capabilities are needed for another user space operation. Type Integer Default 5 (seconds) client_debug_force_sync_read Description If set to true , clients read data directly from OSDs instead of using a local page cache. Type Boolean Default false client_dirsize_rbytes Description If set to true , use the recursive size of a directory (that is, total of all descendants). Type Boolean Default true client_max_inline_size Description Set the maximum size of inlined data stored in a file inode rather than in a separate data object in RADOS. This setting only applies if the inline_data flag is set on the MDS map. Type Integer Default 4096 client_metadata Description Comma-delimited strings for client metadata sent to each MDS, in addition to the automatically generated version, host name, and other metadata. Type String Default "" (no additional metadata) client_mount_gid Description Set the group ID of CephFS mount. Type Integer Default -1 client_mount_timeout Description Set the timeout for CephFS mount in seconds. Type Float Default 300.0 client_mount_uid Description Set the user ID of CephFS mount. Type Integer Default -1 client_mountpoint Description An alternative to the -r option of the ceph-fuse command. Type String Default / client_oc Description Enable object caching. Type Boolean Default true client_oc_max_dirty Description Set the maximum number of dirty bytes in the object cache. Type Integer Default 104857600 (100MB) client_oc_max_dirty_age Description Set the maximum age in seconds of dirty data in the object cache before writeback. Type Float Default 5.0 (seconds) client_oc_max_objects Description Set the maximum number of objects in the object cache. Type Integer Default 1000 client_oc_size Description Set how many bytes of data will the client cache. Type Integer Default 209715200 (200 MB) client_oc_target_dirty Description Set the target size of dirty data. Red Hat recommends keeping this number low. Type Integer Default 8388608 (8MB) client_permissions Description Check client permissions on all I/O operations. Type Boolean Default true client_quota_df Description Report root directory quota for the statfs operation. Type Boolean Default true client_readahead_max_bytes Description Set the maximum number of bytes that the kernel reads ahead for future read operations. Overridden by the client_readahead_max_periods setting. Type Integer Default 0 (unlimited) client_readahead_max_periods Description Set the number of file layout periods (object size * number of stripes) that the kernel reads ahead. Overrides the client_readahead_max_bytes setting. Type Integer Default 4 client_readahead_min Description Set the minimum number bytes that the kernel reads ahead. Type Integer Default 131072 (128KB) client_snapdir Description Set the snapshot directory name. Type String Default ".snap" client_tick_interval Description Set the interval in seconds between capability renewal and other upkeep. Type Float Default 1.0 client_use_random_mds Description Choose random MDS for each request. Type Boolean Default false fuse_default_permissions Description When set to false , the ceph-fuse utility checks does its own permissions checking, instead of relying on the permissions enforcement in FUSE. Set to false together with the client acl type=posix_acl option to enable POSIX ACL. Type Boolean Default true Developer Options These options are internal. They are listed here only to complete the list of options. client_debug_getattr_caps Description Check if the reply from the MDS contains required capabilities. Type Boolean Default false client_debug_inject_tick_delay Description Add artificial delay between client ticks. Type Integer Default 0 client_inject_fixed_oldest_tid Description, Type Boolean Default false client_inject_release_failure Description, Type Boolean Default false client_trace Description The path to the trace file for all file operations. The output is designed to be used by the Ceph synthetic client. See the ceph-syn(8) manual page for details. Type String Default "" (disabled)

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