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https://github.com/ceph/ceph
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94 lines
2.0 KiB
ReStructuredText
94 lines
2.0 KiB
ReStructuredText
============================
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KeyValueStore Config Reference
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============================
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KeyValueStore is a another OSD backend compared to FileStore. Now it mainly
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use LevelDB as backend.
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KeyValueStore doesn't need jounal device, each op will flush into backend
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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 keyvaluestore queue.
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``keyvaluestore queue max ops``
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:Description: Defines the maximum number of in progress operations the 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 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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Misc
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====
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``keyvaluestore default strip size``
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:Description: each object will be split into multi key/value pairs stored into
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backend.
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Note: now this option is important to performance for estimable
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workload
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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 number of header cache, it just like "inode" in local
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filesystem. The larger cache size will be help for performance
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:Type: Integer
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:Required: No
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:Default: ``4096``
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