mirror of
https://github.com/ceph/ceph
synced 2024-12-22 11:31:55 +00:00
308 lines
6.6 KiB
ReStructuredText
308 lines
6.6 KiB
ReStructuredText
============================
|
|
Filestore Config Reference
|
|
============================
|
|
|
|
|
|
``filestore debug omap check``
|
|
|
|
:Description: Debugging check on synchronization. Expensive. For debugging only.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``0``
|
|
|
|
|
|
.. index:: filestore; extended attributes
|
|
|
|
Extended Attributes
|
|
===================
|
|
|
|
Extended Attributes (XATTRs) are an important aspect in your configuration.
|
|
Some file systems have limits on the number of bytes stored in XATTRS.
|
|
Additionally, in some cases, the filesystem may not be as fast as an alternative
|
|
method of storing XATTRs. The following settings may help improve performance
|
|
by using a method of storing XATTRs that is extrinsic to the underlying filesystem.
|
|
|
|
Ceph XATTRs are stored as ``inline xattr``, using the XATTRs provided
|
|
by the underlying file system, if it does not impose a size limit. If
|
|
there is a size limit (4KB total on ext4, for instance), some Ceph
|
|
XATTRs will be stored in an key/value database when either the
|
|
``filestore max inline xattr size`` or ``filestore max inline
|
|
xattrs`` threshold is reached.
|
|
|
|
|
|
``filestore max inline xattr size``
|
|
|
|
: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.
|
|
:Type: Unsigned 32-bit Integer
|
|
:Required: No
|
|
:Default: ``512``
|
|
|
|
|
|
``filestore max inline xattrs``
|
|
|
|
:Description: The maximum number of XATTRs stored in the fileystem per object.
|
|
:Type: 32-bit Integer
|
|
:Required: No
|
|
:Default: ``2``
|
|
|
|
.. index:: filestore; synchronization
|
|
|
|
Synchronization Intervals
|
|
=========================
|
|
|
|
Periodically, the filestore needs to quiesce writes and synchronize the
|
|
filesystem, which creates a consistent commit point. It can then free journal
|
|
entries up to the commit point. Synchronizing more frequently tends to reduce
|
|
the time required to perform synchronization, and reduces the amount of data
|
|
that needs to remain in the journal. Less frequent synchronization allows the
|
|
backing filesystem to coalesce small writes and metadata updates more
|
|
optimally--potentially resulting in more efficient synchronization.
|
|
|
|
|
|
``filestore max sync interval``
|
|
|
|
:Description: The maximum interval in seconds for synchronizing the filestore.
|
|
:Type: Double
|
|
:Required: No
|
|
:Default: ``5``
|
|
|
|
|
|
``filestore min sync interval``
|
|
|
|
:Description: The minimum interval in seconds for synchronizing the filestore.
|
|
:Type: Double
|
|
:Required: No
|
|
:Default: ``.01``
|
|
|
|
|
|
.. index:: filestore; flusher
|
|
|
|
Flusher
|
|
=======
|
|
|
|
The filestore flusher forces data from large writes to be written out using
|
|
``sync file range`` before the sync in order to (hopefully) reduce the cost of
|
|
the eventual sync. In practice, disabling 'filestore flusher' seems to improve
|
|
performance in some cases.
|
|
|
|
|
|
``filestore flusher``
|
|
|
|
:Description: Enables the filestore flusher.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
.. deprecated:: v.65
|
|
|
|
``filestore flusher max fds``
|
|
|
|
:Description: Sets the maximum number of file descriptors for the flusher.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``512``
|
|
|
|
.. deprecated:: v.65
|
|
|
|
``filestore sync flush``
|
|
|
|
:Description: Enables the synchronization flusher.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
.. deprecated:: v.65
|
|
|
|
``filestore fsync flushes journal data``
|
|
|
|
:Description: Flush journal data during filesystem synchronization.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
.. index:: filestore; queue
|
|
|
|
Queue
|
|
=====
|
|
|
|
The following settings provide limits on the size of filestore queue.
|
|
|
|
``filestore queue max ops``
|
|
|
|
:Description: Defines the maximum number of in progress operations the file store accepts before blocking on queuing new operations.
|
|
:Type: Integer
|
|
:Required: No. Minimal impact on performance.
|
|
:Default: ``500``
|
|
|
|
|
|
``filestore queue max bytes``
|
|
|
|
:Description: The maximum number of bytes for an operation.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``100 << 20``
|
|
|
|
|
|
``filestore queue committing max ops``
|
|
|
|
:Description: The maximum number of operations the filestore can commit.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``500``
|
|
|
|
|
|
``filestore queue committing max bytes``
|
|
|
|
:Description: The maximum number of bytes the filestore can commit.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``100 << 20``
|
|
|
|
|
|
.. index:: filestore; timeouts
|
|
|
|
Timeouts
|
|
========
|
|
|
|
|
|
``filestore op threads``
|
|
|
|
:Description: The number of filesystem operation threads that execute in parallel.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``2``
|
|
|
|
|
|
``filestore op thread timeout``
|
|
|
|
:Description: The timeout for a filesystem operation thread (in seconds).
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``60``
|
|
|
|
|
|
``filestore op thread suicide timeout``
|
|
|
|
:Description: The timeout for a commit operation before cancelling the commit (in seconds).
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``180``
|
|
|
|
|
|
.. index:: filestore; btrfs
|
|
|
|
B-Tree Filesystem
|
|
=================
|
|
|
|
|
|
``filestore btrfs snap``
|
|
|
|
:Description: Enable snapshots for a ``btrfs`` filestore.
|
|
:Type: Boolean
|
|
:Required: No. Only used for ``btrfs``.
|
|
:Default: ``true``
|
|
|
|
|
|
``filestore btrfs clone range``
|
|
|
|
:Description: Enable cloning ranges for a ``btrfs`` filestore.
|
|
:Type: Boolean
|
|
:Required: No. Only used for ``btrfs``.
|
|
:Default: ``true``
|
|
|
|
|
|
.. index:: filestore; journal
|
|
|
|
Journal
|
|
=======
|
|
|
|
|
|
``filestore journal parallel``
|
|
|
|
:Description: Enables parallel journaling, default for btrfs.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
``filestore journal writeahead``
|
|
|
|
:Description: Enables writeahead journaling, default for xfs.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
``filestore journal trailing``
|
|
|
|
:Description: Deprecated, never use.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
Misc
|
|
====
|
|
|
|
|
|
``filestore merge threshold``
|
|
|
|
:Description: Min number of files in a subdir before merging into parent
|
|
NOTE: A negative value means to disable subdir merging
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``10``
|
|
|
|
|
|
``filestore split multiple``
|
|
|
|
:Description: ``filestore_split_multiple * abs(filestore_merge_threshold) * 16``
|
|
is the maximum number of files in a subdirectory before
|
|
splitting into child directories.
|
|
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``2``
|
|
|
|
|
|
``filestore update to``
|
|
|
|
:Description: Limits filestore auto upgrade to specified version.
|
|
:Type: Integer
|
|
:Required: No
|
|
:Default: ``1000``
|
|
|
|
|
|
``filestore blackhole``
|
|
|
|
:Description: Drop any new transactions on the floor.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
``filestore dump file``
|
|
|
|
:Description: File onto which store transaction dumps.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
``filestore kill at``
|
|
|
|
:Description: inject a failure at the n'th opportunity
|
|
:Type: String
|
|
:Required: No
|
|
:Default: ``false``
|
|
|
|
|
|
``filestore fail eio``
|
|
|
|
:Description: Fail/Crash on eio.
|
|
:Type: Boolean
|
|
:Required: No
|
|
:Default: ``true``
|
|
|