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https://github.com/ceph/ceph
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315 lines
6.8 KiB
ReStructuredText
315 lines
6.8 KiB
ReStructuredText
============================
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Filestore Config Reference
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============================
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``filestore debug omap check``
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:Description: Debugging check on synchronization. Expensive. For debugging only.
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:Type: Boolean
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:Required: No
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:Default: ``0``
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.. index:: filestore; extended attributes
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Extended Attributes
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===================
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Extended Attributes (XATTRs) are an important aspect in your configuration.
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Some file systems have limits on the number of bytes stored in XATTRS.
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Additionally, in some cases, the filesystem may not be as fast as an alternative
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method of storing XATTRs. The following settings may help improve performance
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by using a method of storing XATTRs that is extrinsic to the underlying filesystem.
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Ceph XATTRs are stored as ``inline xattr``, using the XATTRs provided
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by the underlying file system, if it does not impose a size limit. If
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there is a size limit ( 4KB total on ext4, for instance ), some Ceph
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XATTRs will be stored in an key/value database ( aka ``omap`` ) when
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the ``filestore max inline xattr size`` or ``filestore max inline
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xattrs`` threshold are reached.
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``filestore xattr use omap``
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:Description: Use object map for XATTRS. Set to ``true`` for ``ext4`` file systems.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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``filestore max inline xattr size``
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:Description: The maximimum size of an XATTR stored in the filesystem (i.e., XFS, btrfs, ext4, etc.) per object. Should not be larger than the filesytem can handle.
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:Type: Unsigned 32-bit Integer
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:Required: No
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:Default: ``512``
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``filestore max inline xattrs``
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:Description: The maximum number of XATTRs stored in the fileystem per object.
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:Type: 32-bit Integer
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:Required: No
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:Default: ``2``
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.. index:: filestore; synchronization
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Synchronization Intervals
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=========================
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Periodically, the filestore needs to quiesce writes and synchronize the
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filesystem, which creates a consistent commit point. It can then free journal
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entries up to the commit point. Synchronizing more frequently tends to reduce
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the time required to perform synchronization, and reduces the amount of data
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that needs to remain in the journal. Less frequent synchronization allows the
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backing filesystem to coalesce small writes and metadata updates more
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optimally--potentially resulting in more efficient synchronization.
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``filestore max sync interval``
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:Description: The maximum interval in seconds for synchronizing the filestore.
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:Type: Double
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:Required: No
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:Default: ``5``
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``filestore min sync interval``
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:Description: The minimum interval in seconds for synchronizing the filestore.
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:Type: Double
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:Required: No
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:Default: ``.01``
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.. index:: filestore; flusher
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Flusher
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=======
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The filestore flusher forces data from large writes to be written out using
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``sync file range`` before the sync in order to (hopefully) reduce the cost of
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the eventual sync. In practice, disabling 'filestore flusher' seems to improve
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performance in some cases.
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``filestore flusher``
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:Description: Enables the filestore flusher.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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.. deprecated:: v.65
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``filestore flusher max fds``
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:Description: Sets the maximum number of file descriptors for the flusher.
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:Type: Integer
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:Required: No
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:Default: ``512``
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.. deprecated:: v.65
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``filestore sync flush``
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:Description: Enables the synchronization flusher.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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.. deprecated:: v.65
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``filestore fsync flushes journal data``
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:Description: Flush journal data during filesystem synchronization.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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.. index:: filestore; queue
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Queue
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=====
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The following settings provide limits on the size of filestore queue.
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``filestore queue max ops``
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:Description: Defines the maximum number of in progress operations the file store accepts before blocking on queuing new operations.
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:Type: Integer
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:Required: No. Minimal impact on performance.
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:Default: ``500``
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``filestore queue max bytes``
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:Description: The maximum number of bytes for an operation.
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:Type: Integer
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:Required: No
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:Default: ``100 << 20``
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``filestore queue committing max ops``
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:Description: The maximum number of operations the filestore can commit.
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:Type: Integer
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:Required: No
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:Default: ``500``
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``filestore queue committing max bytes``
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:Description: The maximum number of bytes the filestore can commit.
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:Type: Integer
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:Required: No
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:Default: ``100 << 20``
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.. index:: filestore; timeouts
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Timeouts
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========
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``filestore op threads``
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:Description: The number of filesystem operation threads that execute in parallel.
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:Type: Integer
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:Required: No
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:Default: ``2``
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``filestore op thread timeout``
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:Description: The timeout for a filesystem operation thread (in seconds).
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:Type: Integer
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:Required: No
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:Default: ``60``
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``filestore op thread suicide timeout``
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:Description: The timeout for a commit operation before cancelling the commit (in seconds).
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:Type: Integer
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:Required: No
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:Default: ``180``
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.. index:: filestore; btrfs
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B-Tree Filesystem
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=================
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``filestore btrfs snap``
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:Description: Enable snapshots for a ``btrfs`` filestore.
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:Type: Boolean
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:Required: No. Only used for ``btrfs``.
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:Default: ``true``
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``filestore btrfs clone range``
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:Description: Enable cloning ranges for a ``btrfs`` filestore.
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:Type: Boolean
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:Required: No. Only used for ``btrfs``.
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:Default: ``true``
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.. index:: filestore; journal
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Journal
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=======
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``filestore journal parallel``
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:Description: Enables parallel journaling, default for btrfs.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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``filestore journal writeahead``
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:Description: Enables writeahead journaling, default for xfs.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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``filestore journal trailing``
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:Description: Deprecated, never use.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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Misc
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====
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``filestore merge threshold``
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:Description: Min number of files in a subdir before merging into parent
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NOTE: A negative value means to disable subdir merging
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:Type: Integer
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:Required: No
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:Default: ``10``
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``filestore split multiple``
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:Description: ``filestore_split_multiple * abs(filestore_merge_threshold) * 16``
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is the maximum number of files in a subdirectory before
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splitting into child directories.
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:Type: Integer
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:Required: No
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:Default: ``2``
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``filestore update to``
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:Description: Limits filestore auto upgrade to specified version.
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:Type: Integer
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:Required: No
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:Default: ``1000``
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``filestore blackhole``
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:Description: Drop any new transactions on the floor.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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``filestore dump file``
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:Description: File onto which store transaction dumps.
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:Type: Boolean
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:Required: No
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:Default: ``false``
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``filestore kill at``
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:Description: inject a failure at the n'th opportunity
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:Type: String
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:Required: No
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:Default: ``false``
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``filestore fail eio``
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:Description: Fail/Crash on eio.
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:Type: Boolean
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:Required: No
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:Default: ``true``
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