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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_aclto enable POSIX ACL, or an empty string. This option only takes effect when thefuse_default_permissionsis set tofalse. - 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_dataflag 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
-roption of theceph-fusecommand. - 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
statfsoperation. - 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_periodssetting. - 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_bytessetting. - 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, theceph-fuseutility checks does its own permissions checking, instead of relying on the permissions enforcement in FUSE. Set to false together with theclient acl type=posix_acloption 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)
