====================== MDS Config Reference ====================== ``mon force standby active`` :Description: If ``true`` monitors force standby-replay to be active. Set under ``[mon]`` or ``[global]``. :Type: Boolean :Default: ``true`` ``mds max file size`` :Description: The maximum allowed file size to set when creating a new file system. :Type: 64-bit Integer Unsigned :Default: ``1ULL << 40`` ``mds cache size`` :Description: The number of inodes to cache. :Type: 32-bit Integer :Default: ``100000`` ``mds cache mid`` :Description: The insertion point for new items in the cache LRU (from the top). :Type: Float :Default: ``0.7`` ``mds dir commit ratio`` :Description: The fraction of directory that is dirty before Ceph commits using a full update (instead of partial update). :Type: Float :Default: ``0.5`` ``mds dir max commit size`` :Description: The maximum size of a directory update before Ceph breaks it into smaller transactions) (MB). :Type: 32-bit Integer :Default: ``90`` ``mds decay halflife`` :Description: The half-life of MDS cache temperature. :Type: Float :Default: ``5`` ``mds beacon interval`` :Description: The frequency (in seconds) of beacon messages sent to the monitor. :Type: Float :Default: ``4`` ``mds beacon grace`` :Description: The interval without beacons before Ceph declares an MDS laggy (and possibly replace it). :Type: Float :Default: ``15`` ``mds blacklist interval`` :Description: The blacklist duration for failed MDSs in the OSD map. :Type: Float :Default: ``24.0*60.0`` ``mds session timeout`` :Description: The interval (in seconds) of client inactivity before Ceph times out capabilities and leases. :Type: Float :Default: ``60`` ``mds session autoclose`` :Description: The interval (in seconds) before Ceph closes a laggy client's session. :Type: Float :Default: ``300`` ``mds reconnect timeout`` :Description: The interval (in seconds) to wait for clients to reconnect during MDS restart. :Type: Float :Default: ``45`` ``mds tick interval`` :Description: How frequently the MDS performs internal periodic tasks. :Type: Float :Default: ``5`` ``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`` :Description: How quickly dirstat changes propagate up. :Type: Float :Default: ``5`` ``mds client prealloc inos`` :Description: The number of inode numbers to preallocate per client session. :Type: 32-bit Integer :Default: ``1000`` ``mds early reply`` :Description: Determines whether the MDS should allow clients to see request results before they commit to the journal. :Type: Boolean :Default: ``true`` ``mds use tmap`` :Description: Use trivialmap for directory updates. :Type: Boolean :Default: ``true`` ``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`` :Description: Set to ``true`` if the MDS should journal metadata updates (disabled for benchmarking only). :Type: Boolean :Default: ``true`` ``mds log skip corrupt events`` :Description: Determines whether the MDS should try to skip corrupt journal events during journal replay. :Type: Boolean :Default: ``false`` ``mds log max events`` :Description: The maximum events in the journal before we initiate trimming. Set to ``-1`` to disable limits. :Type: 32-bit Integer :Default: ``-1`` ``mds log max segments`` :Description: The maximum number of segments (objects) in the journal before we initiate trimming. Set to ``-1`` to disable limits. :Type: 32-bit Integer :Default: ``30`` ``mds log max expiring`` :Description: The maximum number of segments to expire in parallels :Type: 32-bit Integer :Default: ``20`` ``mds log eopen size`` :Description: The maximum number of inodes in an EOpen event. :Type: 32-bit Integer :Default: ``100`` ``mds bal sample interval`` :Description: Determines how frequently to sample directory temperature (for fragmentation decisions). :Type: Float :Default: ``3`` ``mds bal replicate threshold`` :Description: The maximum temperature before Ceph attempts to replicate metadata to other nodes. :Type: Float :Default: ``8000`` ``mds bal unreplicate threshold`` :Description: The minimum temperature before Ceph stops replicating metadata to other nodes. :Type: Float :Default: ``0`` ``mds bal frag`` :Description: Determines whether the MDS will fragment directories. :Type: Boolean :Default: ``false`` ``mds bal split size`` :Description: The maximum directory size before the MDS will split a directory fragment into smaller bits. :Type: 32-bit Integer :Default: ``10000`` ``mds bal split rd`` :Description: The maximum directory read temperature before Ceph splits a directory fragment. :Type: Float :Default: ``25000`` ``mds bal split wr`` :Description: The maximum directory write temperature before Ceph splits a directory fragment. :Type: Float :Default: ``10000`` ``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`` :Description: The minimum directory size before Ceph tries to merge adjacent directory fragments. :Type: 32-bit Integer :Default: ``50`` ``mds bal interval`` :Description: The frequency (in seconds) of workload exchanges between MDSs. :Type: 32-bit Integer :Default: ``10`` ``mds bal fragment interval`` :Description: The delay (in seconds) between a fragment being elegible for split or merge and executing the fragmentation change. :Type: 32-bit Integer :Default: ``5`` ``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`` :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`` :Description: The minimum temperature before Ceph migrates a subtree back to its parent. :Type: Float :Default: ``0`` ``mds bal max`` :Description: The number of iterations to run balancer before Ceph stops. (used for testing purposes only) :Type: 32-bit Integer :Default: ``-1`` ``mds bal max until`` :Description: The number of seconds to run balancer before Ceph stops. (used for testing purposes only) :Type: 32-bit Integer :Default: ``-1`` ``mds bal mode`` :Description: The method for calculating MDS load. - ``0`` = Hybrid. - ``1`` = Request rate and latency. - ``2`` = CPU load. :Type: 32-bit Integer :Default: ``0`` ``mds bal min rebalance`` :Description: The minimum subtree temperature before Ceph migrates. :Type: Float :Default: ``0.1`` ``mds bal min start`` :Description: The minimum subtree temperature before Ceph searches a subtree. :Type: Float :Default: ``0.2`` ``mds bal need min`` :Description: The minimum fraction of target subtree size to accept. :Type: Float :Default: ``0.8`` ``mds bal need max`` :Description: The maximum fraction of target subtree size to accept. :Type: Float :Default: ``1.2`` ``mds bal midchunk`` :Description: Ceph will migrate any subtree that is larger than this fraction of the target subtree size. :Type: Float :Default: ``0.3`` ``mds bal minchunk`` :Description: Ceph will ignore any subtree that is smaller than this fraction of the target subtree size. :Type: Float :Default: ``0.001`` ``mds bal target removal min`` :Description: The minimum number of balancer iterations before Ceph removes an old MDS target from the MDS map. :Type: 32-bit Integer :Default: ``5`` ``mds bal target removal max`` :Description: The maximum number of balancer iteration before Ceph removes an old MDS target from the MDS map. :Type: 32-bit Integer :Default: ``10`` ``mds replay interval`` :Description: The journal poll interval when in standby-replay mode. ("hot standby") :Type: Float :Default: ``1`` ``mds shutdown check`` :Description: The interval for polling the cache during MDS shutdown. :Type: 32-bit Integer :Default: ``0`` ``mds thrash exports`` :Description: Ceph will randomly export subtrees between nodes (testing only). :Type: 32-bit Integer :Default: ``0`` ``mds thrash fragments`` :Description: Ceph will randomly fragment or merge directories. :Type: 32-bit Integer :Default: ``0`` ``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`` :Description: Ceph will dump MDS cache contents to a file after rejoining the cache (during recovery). :Type: Boolean :Default: ``false`` ``mds verify scatter`` :Description: Ceph will assert that various scatter/gather invariants are ``true`` (developers only). :Type: Boolean :Default: ``false`` ``mds debug scatterstat`` :Description: Ceph will assert that various recursive stat invariants are ``true`` (for developers only). :Type: Boolean :Default: ``false`` ``mds debug frag`` :Description: Ceph will verify directory fragmentation invariants when convenient (developers only). :Type: Boolean :Default: ``false`` ``mds debug auth pins`` :Description: The debug auth pin invariants (for developers only). :Type: Boolean :Default: ``false`` ``mds debug subtrees`` :Description: The debug subtree invariants (for developers only). :Type: Boolean :Default: ``false`` ``mds kill mdstable at`` :Description: Ceph will inject MDS failure in MDSTable code (for developers only). :Type: 32-bit Integer :Default: ``0`` ``mds kill export at`` :Description: Ceph will inject MDS failure in the subtree export code (for developers only). :Type: 32-bit Integer :Default: ``0`` ``mds kill import at`` :Description: Ceph will inject MDS failure in the subtree import code (for developers only). :Type: 32-bit Integer :Default: ``0`` ``mds kill link at`` :Description: Ceph will inject MDS failure in hard link code (for developers only). :Type: 32-bit Integer :Default: ``0`` ``mds kill rename at`` :Description: Ceph will inject MDS failure in the rename code (for developers only). :Type: 32-bit Integer :Default: ``0`` ``mds wipe sessions`` :Description: Ceph will delete all client sessions on startup (for testing only). :Type: Boolean :Default: ``0`` ``mds wipe ino prealloc`` :Description: Ceph will delete ino preallocation metadata on startup (for testing only). :Type: Boolean :Default: ``0`` ``mds skip ino`` :Description: The number of inode numbers to skip on startup (for testing only). :Type: 32-bit Integer :Default: ``0`` ``mds standby for name`` :Description: An MDS daemon will standby for another MDS daemon of the name specified in this setting. :Type: String :Default: N/A ``mds standby for rank`` :Description: An MDS daemon will standby for an MDS daemon of this rank. :Type: 32-bit Integer :Default: ``-1`` ``mds standby replay`` :Description: Determines whether a ``ceph-mds`` daemon should poll and replay the log of an active MDS (hot standby). :Type: Boolean :Default: ``false``