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https://github.com/ceph/ceph
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95 lines
2.1 KiB
ReStructuredText
95 lines
2.1 KiB
ReStructuredText
===============================
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KeyValueStore Config Reference
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===============================
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``KeyValueStore`` is an alternative OSD backend compared to FileStore.
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Currently, it uses LevelDB as backend. ``KeyValueStore`` doesn't need journal
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device. Each operation will flush into the backend directly.
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``keyvaluestore backend``
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:Description: The backend used by ``KeyValueStore``.
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:Type: String
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:Required: No
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:Default: ``leveldb``
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.. index:: keyvaluestore; queue
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Queue
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=====
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The following settings provide limits on the size of the ``KeyValueStore``
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queue.
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``keyvaluestore queue max ops``
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:Description: Defines the maximum number of operations in progress the
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``KeyValueStore`` 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: ``50``
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``keyvaluestore 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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.. index:: keyvaluestore; thread
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Thread
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========
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``keyvaluestore op threads``
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:Description: The number of ``KeyValueStore`` 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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``keyvaluestore op thread timeout``
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:Description: The timeout for a ``KeyValueStore`` 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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``keyvaluestore op thread suicide timeout``
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:Description: The timeout for a commit operation before canceling 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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Misc
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====
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``keyvaluestore default strip size``
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:Description: Each object will be split into multiple key/value pairs and
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stored in the backend. **Note:** The size of the workload has
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a significant impact on performance.
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:Type: Integer
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:Required: No
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:Default: ``4096``
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``keyvaluestore header cache size``
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:Description: The size of the header cache (identical to ``inode`` in the local
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filesystem). A larger cache size enhances performance.
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:Type: Integer
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:Required: No
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:Default: ``4096``
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