mirror of
https://github.com/ceph/ceph
synced 2024-12-30 07:23:11 +00:00
52f4e545e0
It is now required that all changes to max_mds use the run-time `ceph fs set max_mds` command. The rationale for this change is that it is confusing to have a configuration for max_mds which is only observed at file system creation. Fixes: http://tracker.ceph.com/issues/17105 Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
611 lines
12 KiB
ReStructuredText
611 lines
12 KiB
ReStructuredText
======================
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MDS Config Reference
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======================
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``mon force standby active``
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:Description: If ``true`` monitors force standby-replay to be active. Set
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under ``[mon]`` or ``[global]``.
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:Type: Boolean
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:Default: ``true``
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``mds max file size``
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:Description: The maximum allowed file size to set when creating a
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new file system.
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:Type: 64-bit Integer Unsigned
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:Default: ``1ULL << 40``
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``mds cache size``
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:Description: The number of inodes to cache.
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:Type: 32-bit Integer
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:Default: ``100000``
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``mds cache mid``
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:Description: The insertion point for new items in the cache LRU
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(from the top).
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:Type: Float
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:Default: ``0.7``
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``mds dir commit ratio``
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:Description: The fraction of directory that is dirty before Ceph commits using
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a full update (instead of partial update).
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:Type: Float
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:Default: ``0.5``
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``mds dir max commit size``
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:Description: The maximum size of a directory update before Ceph breaks it into
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smaller transactions) (MB).
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:Type: 32-bit Integer
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:Default: ``90``
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``mds decay halflife``
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:Description: The half-life of MDS cache temperature.
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:Type: Float
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:Default: ``5``
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``mds beacon interval``
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:Description: The frequency (in seconds) of beacon messages sent
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to the monitor.
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:Type: Float
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:Default: ``4``
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``mds beacon grace``
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:Description: The interval without beacons before Ceph declares an MDS laggy
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(and possibly replace it).
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:Type: Float
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:Default: ``15``
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``mds blacklist interval``
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:Description: The blacklist duration for failed MDSs in the OSD map.
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:Type: Float
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:Default: ``24.0*60.0``
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``mds session timeout``
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:Description: The interval (in seconds) of client inactivity before Ceph
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times out capabilities and leases.
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:Type: Float
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:Default: ``60``
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``mds session autoclose``
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:Description: The interval (in seconds) before Ceph closes
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a laggy client's session.
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:Type: Float
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:Default: ``300``
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``mds reconnect timeout``
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:Description: The interval (in seconds) to wait for clients to reconnect
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during MDS restart.
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:Type: Float
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:Default: ``45``
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``mds tick interval``
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:Description: How frequently the MDS performs internal periodic tasks.
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:Type: Float
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:Default: ``5``
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``mds dirstat min interval``
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:Description: The minimum interval (in seconds) to try to avoid propagating
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recursive stats up the tree.
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:Type: Float
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:Default: ``1``
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``mds scatter nudge interval``
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:Description: How quickly dirstat changes propagate up.
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:Type: Float
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:Default: ``5``
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``mds client prealloc inos``
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:Description: The number of inode numbers to preallocate per client session.
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:Type: 32-bit Integer
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:Default: ``1000``
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``mds early reply``
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:Description: Determines whether the MDS should allow clients to see request
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results before they commit to the journal.
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:Type: Boolean
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:Default: ``true``
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``mds use tmap``
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:Description: Use trivialmap for directory updates.
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:Type: Boolean
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:Default: ``true``
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``mds default dir hash``
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:Description: The function to use for hashing files across directory fragments.
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:Type: 32-bit Integer
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:Default: ``2`` (i.e., rjenkins)
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``mds log``
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:Description: Set to ``true`` if the MDS should journal metadata updates
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(disabled for benchmarking only).
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:Type: Boolean
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:Default: ``true``
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``mds log skip corrupt events``
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:Description: Determines whether the MDS should try to skip corrupt journal
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events during journal replay.
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:Type: Boolean
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:Default: ``false``
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``mds log max events``
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:Description: The maximum events in the journal before we initiate trimming.
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Set to ``-1`` to disable limits.
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:Type: 32-bit Integer
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:Default: ``-1``
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``mds log max segments``
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:Description: The maximum number of segments (objects) in the journal before
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we initiate trimming. Set to ``-1`` to disable limits.
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:Type: 32-bit Integer
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:Default: ``30``
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``mds log max expiring``
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:Description: The maximum number of segments to expire in parallels
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:Type: 32-bit Integer
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:Default: ``20``
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``mds log eopen size``
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:Description: The maximum number of inodes in an EOpen event.
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:Type: 32-bit Integer
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:Default: ``100``
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``mds bal sample interval``
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:Description: Determines how frequently to sample directory temperature
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(for fragmentation decisions).
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:Type: Float
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:Default: ``3``
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``mds bal replicate threshold``
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:Description: The maximum temperature before Ceph attempts to replicate
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metadata to other nodes.
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:Type: Float
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:Default: ``8000``
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``mds bal unreplicate threshold``
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:Description: The minimum temperature before Ceph stops replicating
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metadata to other nodes.
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:Type: Float
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:Default: ``0``
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``mds bal frag``
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:Description: Determines whether the MDS will fragment directories.
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:Type: Boolean
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:Default: ``false``
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``mds bal split size``
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:Description: The maximum directory size before the MDS will split a directory
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fragment into smaller bits.
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:Type: 32-bit Integer
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:Default: ``10000``
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``mds bal split rd``
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:Description: The maximum directory read temperature before Ceph splits
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a directory fragment.
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:Type: Float
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:Default: ``25000``
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``mds bal split wr``
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:Description: The maximum directory write temperature before Ceph splits
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a directory fragment.
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:Type: Float
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:Default: ``10000``
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``mds bal split bits``
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:Description: The number of bits by which to split a directory fragment.
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:Type: 32-bit Integer
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:Default: ``3``
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``mds bal merge size``
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:Description: The minimum directory size before Ceph tries to merge
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adjacent directory fragments.
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:Type: 32-bit Integer
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:Default: ``50``
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``mds bal merge rd``
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:Description: The minimum read temperature before Ceph merges
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adjacent directory fragments.
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:Type: Float
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:Default: ``1000``
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``mds bal merge wr``
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:Description: The minimum write temperature before Ceph merges
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adjacent directory fragments.
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:Type: Float
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:Default: ``1000``
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``mds bal interval``
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:Description: The frequency (in seconds) of workload exchanges between MDSs.
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:Type: 32-bit Integer
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:Default: ``10``
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``mds bal fragment interval``
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:Description: The frequency (in seconds) of adjusting directory fragmentation.
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:Type: 32-bit Integer
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:Default: ``5``
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``mds bal idle threshold``
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:Description: The minimum temperature before Ceph migrates a subtree
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back to its parent.
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:Type: Float
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:Default: ``0``
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``mds bal max``
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:Description: The number of iterations to run balancer before Ceph stops.
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(used for testing purposes only)
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:Type: 32-bit Integer
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:Default: ``-1``
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``mds bal max until``
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:Description: The number of seconds to run balancer before Ceph stops.
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(used for testing purposes only)
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:Type: 32-bit Integer
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:Default: ``-1``
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``mds bal mode``
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:Description: The method for calculating MDS load.
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- ``1`` = Hybrid.
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- ``2`` = Request rate and latency.
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- ``3`` = CPU load.
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:Type: 32-bit Integer
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:Default: ``0``
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``mds bal min rebalance``
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:Description: The minimum subtree temperature before Ceph migrates.
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:Type: Float
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:Default: ``0.1``
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``mds bal min start``
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:Description: The minimum subtree temperature before Ceph searches a subtree.
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:Type: Float
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:Default: ``0.2``
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``mds bal need min``
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:Description: The minimum fraction of target subtree size to accept.
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:Type: Float
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:Default: ``0.8``
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``mds bal need max``
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:Description: The maximum fraction of target subtree size to accept.
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:Type: Float
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:Default: ``1.2``
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``mds bal midchunk``
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:Description: Ceph will migrate any subtree that is larger than this fraction
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of the target subtree size.
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:Type: Float
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:Default: ``0.3``
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``mds bal minchunk``
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:Description: Ceph will ignore any subtree that is smaller than this fraction
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of the target subtree size.
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:Type: Float
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:Default: ``0.001``
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``mds bal target removal min``
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:Description: The minimum number of balancer iterations before Ceph removes
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an old MDS target from the MDS map.
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:Type: 32-bit Integer
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:Default: ``5``
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``mds bal target removal max``
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:Description: The maximum number of balancer iteration before Ceph removes
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an old MDS target from the MDS map.
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:Type: 32-bit Integer
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:Default: ``10``
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``mds replay interval``
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:Description: The journal poll interval when in standby-replay mode.
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("hot standby")
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:Type: Float
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:Default: ``1``
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``mds shutdown check``
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:Description: The interval for polling the cache during MDS shutdown.
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:Type: 32-bit Integer
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:Default: ``0``
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``mds thrash exports``
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:Description: Ceph will randomly export subtrees between nodes (testing only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds thrash fragments``
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:Description: Ceph will randomly fragment or merge directories.
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:Type: 32-bit Integer
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:Default: ``0``
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``mds dump cache on map``
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:Description: Ceph will dump the MDS cache contents to a file on each MDSMap.
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:Type: Boolean
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:Default: ``false``
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``mds dump cache after rejoin``
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:Description: Ceph will dump MDS cache contents to a file after
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rejoining the cache (during recovery).
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:Type: Boolean
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:Default: ``false``
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``mds verify scatter``
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:Description: Ceph will assert that various scatter/gather invariants
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are ``true`` (developers only).
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:Type: Boolean
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:Default: ``false``
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``mds debug scatterstat``
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:Description: Ceph will assert that various recursive stat invariants
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are ``true`` (for developers only).
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:Type: Boolean
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:Default: ``false``
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``mds debug frag``
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:Description: Ceph will verify directory fragmentation invariants
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when convenient (developers only).
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:Type: Boolean
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:Default: ``false``
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``mds debug auth pins``
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:Description: The debug auth pin invariants (for developers only).
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:Type: Boolean
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:Default: ``false``
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``mds debug subtrees``
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:Description: The debug subtree invariants (for developers only).
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:Type: Boolean
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:Default: ``false``
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``mds kill mdstable at``
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:Description: Ceph will inject MDS failure in MDSTable code
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(for developers only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds kill export at``
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:Description: Ceph will inject MDS failure in the subtree export code
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(for developers only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds kill import at``
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:Description: Ceph will inject MDS failure in the subtree import code
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(for developers only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds kill link at``
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:Description: Ceph will inject MDS failure in hard link code
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(for developers only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds kill rename at``
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:Description: Ceph will inject MDS failure in the rename code
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(for developers only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds wipe sessions``
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:Description: Ceph will delete all client sessions on startup
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(for testing only).
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:Type: Boolean
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:Default: ``0``
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``mds wipe ino prealloc``
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:Description: Ceph will delete ino preallocation metadata on startup
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(for testing only).
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:Type: Boolean
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:Default: ``0``
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``mds skip ino``
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:Description: The number of inode numbers to skip on startup
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(for testing only).
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:Type: 32-bit Integer
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:Default: ``0``
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``mds standby for name``
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:Description: An MDS daemon will standby for another MDS daemon of the name
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specified in this setting.
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:Type: String
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:Default: N/A
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``mds standby for rank``
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:Description: An MDS daemon will standby for an MDS daemon of this rank.
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:Type: 32-bit Integer
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:Default: ``-1``
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``mds standby replay``
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:Description: Determines whether a ``ceph-mds`` daemon should poll and replay
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the log of an active MDS (hot standby).
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:Type: Boolean
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:Default: ``false``
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