MDS Config Reference
======================
-``mds cache memory limit``
+``mds_cache_memory_limit``
:Description: The memory limit the MDS should enforce for its cache.
:Type: 64-bit Integer Unsigned
:Default: ``4G``
-``mds cache reservation``
+``mds_cache_reservation``
:Description: The cache reservation (memory or inodes) for the MDS cache to maintain.
Once the MDS begins dipping into its reservation, it will recall
:Default: ``0.05``
-``mds cache mid``
+``mds_cache_mid``
:Description: The insertion point for new items in the cache LRU
(from the top).
:Default: ``0.7``
-``mds dir commit ratio``
+``mds_dir_commit_ratio``
:Description: The fraction of directory that is dirty before Ceph commits using
a full update (instead of partial update).
:Default: ``0.5``
-``mds dir max commit size``
+``mds_dir_max_commit_size``
:Description: The maximum size of a directory update before Ceph breaks it into
- smaller transactions) (MB).
+ smaller transactions (MB).
:Type: 32-bit Integer
-:Default: ``90``
+:Default: ``10``
-``mds decay halflife``
+``mds_decay_halflife``
:Description: The half-life of MDS cache temperature.
:Type: Float
:Default: ``5``
-``mds beacon interval``
+``mds_beacon_interval``
:Description: The frequency (in seconds) of beacon messages sent
to the monitor.
:Default: ``4``
-``mds beacon grace``
+``mds_beacon_grace``
:Description: The interval without beacons before Ceph declares an MDS laggy
(and possibly replace it).
:Default: ``15``
-``mds blacklist interval``
+``mds_blocklist_interval``
-:Description: The blacklist duration for failed MDSs in the OSD map. Note,
+:Description: The blocklist duration for failed MDSs in the OSD map. Note,
this controls how long failed MDS daemons will stay in the
- OSDMap blacklist. It has no effect on how long something is
- blacklisted when the administrator blacklists it manually. For
- example, ``ceph osd blacklist add`` will still use the default
- blacklist time.
+ OSDMap blocklist. It has no effect on how long something is
+ blocklisted when the administrator blocklists it manually. For
+ example, ``ceph osd blocklist add`` will still use the default
+ blocklist time.
:Type: Float
:Default: ``24.0*60.0``
-``mds reconnect timeout``
+``mds_reconnect_timeout``
:Description: The interval (in seconds) to wait for clients to reconnect
during MDS restart.
:Default: ``45``
-``mds tick interval``
+``mds_tick_interval``
:Description: How frequently the MDS performs internal periodic tasks.
:Type: Float
:Default: ``5``
-``mds dirstat min interval``
+``mds_dirstat_min_interval``
:Description: The minimum interval (in seconds) to try to avoid propagating
recursive stats up the tree.
:Type: Float
:Default: ``1``
-``mds scatter nudge interval``
+``mds_scatter_nudge_interval``
:Description: How quickly dirstat changes propagate up.
:Type: Float
:Default: ``5``
-``mds client prealloc inos``
+``mds_client_prealloc_inos``
:Description: The number of inode numbers to preallocate per client session.
:Type: 32-bit Integer
:Default: ``1000``
-``mds early reply``
+``mds_early_reply``
:Description: Determines whether the MDS should allow clients to see request
results before they commit to the journal.
:Default: ``true``
-``mds default dir hash``
+``mds_default_dir_hash``
:Description: The function to use for hashing files across directory fragments.
:Type: 32-bit Integer
:Default: ``2`` (i.e., rjenkins)
-``mds log skip corrupt events``
+``mds_log_skip_corrupt_events``
:Description: Determines whether the MDS should try to skip corrupt journal
events during journal replay.
:Default: ``false``
-``mds log max events``
+``mds_log_max_events``
:Description: The maximum events in the journal before we initiate trimming.
Set to ``-1`` to disable limits.
:Default: ``-1``
-``mds log max segments``
+``mds_log_max_segments``
:Description: The maximum number of segments (objects) in the journal before
we initiate trimming. Set to ``-1`` to disable limits.
:Default: ``128``
-``mds bal sample interval``
+``mds_bal_sample_interval``
:Description: Determines how frequently to sample directory temperature
(for fragmentation decisions).
:Default: ``3``
-``mds bal replicate threshold``
+``mds_bal_replicate_threshold``
:Description: The maximum temperature before Ceph attempts to replicate
metadata to other nodes.
:Default: ``8000``
-``mds bal unreplicate threshold``
+``mds_bal_unreplicate_threshold``
:Description: The minimum temperature before Ceph stops replicating
metadata to other nodes.
:Default: ``0``
-``mds bal split size``
+``mds_bal_split_size``
:Description: The maximum directory size before the MDS will split a directory
fragment into smaller bits.
:Default: ``10000``
-``mds bal split rd``
+``mds_bal_split_rd``
:Description: The maximum directory read temperature before Ceph splits
a directory fragment.
:Default: ``25000``
-``mds bal split wr``
+``mds_bal_split_wr``
:Description: The maximum directory write temperature before Ceph splits
a directory fragment.
:Default: ``10000``
-``mds bal split bits``
+``mds_bal_split_bits``
:Description: The number of bits by which to split a directory fragment.
:Type: 32-bit Integer
:Default: ``3``
-``mds bal merge size``
+``mds_bal_merge_size``
:Description: The minimum directory size before Ceph tries to merge
adjacent directory fragments.
:Default: ``50``
-``mds bal interval``
+``mds_bal_interval``
:Description: The frequency (in seconds) of workload exchanges between MDSs.
:Type: 32-bit Integer
:Default: ``10``
-``mds bal fragment interval``
+``mds_bal_fragment_interval``
:Description: The delay (in seconds) between a fragment being eligible for split
or merge and executing the fragmentation change.
:Default: ``5``
-``mds bal fragment fast factor``
+``mds_bal_fragment_fast_factor``
:Description: The ratio by which frags may exceed the split size before
a split is executed immediately (skipping the fragment interval)
:Type: Float
:Default: ``1.5``
-``mds bal fragment size max``
+``mds_bal_fragment_size_max``
:Description: The maximum size of a fragment before any new entries
are rejected with ENOSPC.
:Type: 32-bit Integer
:Default: ``100000``
-``mds bal idle threshold``
+``mds_bal_idle_threshold``
:Description: The minimum temperature before Ceph migrates a subtree
back to its parent.
:Default: ``0``
-``mds bal max``
+``mds_bal_max``
:Description: The number of iterations to run balancer before Ceph stops.
(used for testing purposes only)
:Default: ``-1``
-``mds bal max until``
+``mds_bal_max_until``
:Description: The number of seconds to run balancer before Ceph stops.
(used for testing purposes only)
:Default: ``-1``
-``mds bal mode``
+``mds_bal_mode``
:Description: The method for calculating MDS load.
:Default: ``0``
-``mds bal min rebalance``
+``mds_bal_min_rebalance``
:Description: The minimum subtree temperature before Ceph migrates.
:Type: Float
:Default: ``0.1``
-``mds bal min start``
+``mds_bal_min_start``
:Description: The minimum subtree temperature before Ceph searches a subtree.
:Type: Float
:Default: ``0.2``
-``mds bal need min``
+``mds_bal_need_min``
:Description: The minimum fraction of target subtree size to accept.
:Type: Float
:Default: ``0.8``
-``mds bal need max``
+``mds_bal_need_max``
:Description: The maximum fraction of target subtree size to accept.
:Type: Float
:Default: ``1.2``
-``mds bal midchunk``
+``mds_bal_midchunk``
:Description: Ceph will migrate any subtree that is larger than this fraction
of the target subtree size.
:Default: ``0.3``
-``mds bal minchunk``
+``mds_bal_minchunk``
:Description: Ceph will ignore any subtree that is smaller than this fraction
of the target subtree size.
:Default: ``0.001``
-``mds bal target removal min``
+``mds_bal_target_removal_min``
:Description: The minimum number of balancer iterations before Ceph removes
an old MDS target from the MDS map.
:Default: ``5``
-``mds bal target removal max``
+``mds_bal_target_removal_max``
-:Description: The maximum number of balancer iteration before Ceph removes
+:Description: The maximum number of balancer iterations before Ceph removes
an old MDS target from the MDS map.
:Type: 32-bit Integer
:Default: ``10``
-``mds replay interval``
+``mds_replay_interval``
:Description: The journal poll interval when in standby-replay mode.
("hot standby")
:Default: ``1``
-``mds shutdown check``
+``mds_shutdown_check``
:Description: The interval for polling the cache during MDS shutdown.
:Type: 32-bit Integer
:Default: ``0``
-``mds thrash exports``
+``mds_thrash_exports``
:Description: Ceph will randomly export subtrees between nodes (testing only).
:Type: 32-bit Integer
:Default: ``0``
-``mds thrash fragments``
+``mds_thrash_fragments``
:Description: Ceph will randomly fragment or merge directories.
:Type: 32-bit Integer
:Default: ``0``
-``mds dump cache on map``
+``mds_dump_cache_on_map``
:Description: Ceph will dump the MDS cache contents to a file on each MDSMap.
:Type: Boolean
:Default: ``false``
-``mds dump cache after rejoin``
+``mds_dump_cache_after_rejoin``
:Description: Ceph will dump MDS cache contents to a file after
rejoining the cache (during recovery).
:Default: ``false``
-``mds verify scatter``
+``mds_verify_scatter``
:Description: Ceph will assert that various scatter/gather invariants
are ``true`` (developers only).
:Default: ``false``
-``mds debug scatterstat``
+``mds_debug_scatterstat``
:Description: Ceph will assert that various recursive stat invariants
are ``true`` (for developers only).
:Default: ``false``
-``mds debug frag``
+``mds_debug_frag``
:Description: Ceph will verify directory fragmentation invariants
when convenient (developers only).
:Default: ``false``
-``mds debug auth pins``
+``mds_debug_auth_pins``
:Description: The debug auth pin invariants (for developers only).
:Type: Boolean
:Default: ``false``
-``mds debug subtrees``
+``mds_debug_subtrees``
:Description: The debug subtree invariants (for developers only).
:Type: Boolean
:Default: ``false``
-``mds kill mdstable at``
+``mds_kill_mdstable_at``
:Description: Ceph will inject MDS failure in MDSTable code
(for developers only).
:Default: ``0``
-``mds kill export at``
+``mds_kill_export_at``
:Description: Ceph will inject MDS failure in the subtree export code
(for developers only).
:Default: ``0``
-``mds kill import at``
+``mds_kill_import_at``
:Description: Ceph will inject MDS failure in the subtree import code
(for developers only).
:Default: ``0``
-``mds kill link at``
+``mds_kill_link_at``
:Description: Ceph will inject MDS failure in hard link code
(for developers only).
:Default: ``0``
-``mds kill rename at``
+``mds_kill_rename_at``
:Description: Ceph will inject MDS failure in the rename code
(for developers only).
:Default: ``0``
-``mds wipe sessions``
+``mds_wipe_sessions``
:Description: Ceph will delete all client sessions on startup
(for testing only).
:Default: ``false``
-``mds wipe ino prealloc``
+``mds_wipe_ino_prealloc``
:Description: Ceph will delete ino preallocation metadata on startup
(for testing only).
:Default: ``false``
-``mds skip ino``
+``mds_skip_ino``
:Description: The number of inode numbers to skip on startup
(for testing only).
:Default: ``0``
-``mds min caps per client``
+``mds_min_caps_per_client``
:Description: Set the minimum number of capabilities a client may hold.
:Type: Integer
:Default: ``100``
-``mds max ratio caps per client``
+``mds_max_ratio_caps_per_client``
:Description: Set the maximum ratio of current caps that may be recalled during MDS cache pressure.
:Type: Float
projects / ceph.git / blobdiff