=============================== KeyValueStore Config Reference =============================== ``KeyValueStore`` is an alternative OSD backend compared to FileStore. Currently, it uses LevelDB as backend. ``KeyValueStore`` doesn't need journal device. Each operation will flush into the backend directly. ``keyvaluestore backend`` :Description: The backend used by ``KeyValueStore``. :Type: String :Required: No :Default: ``leveldb`` .. index:: keyvaluestore; queue Queue ===== The following settings provide limits on the size of the ``KeyValueStore`` queue. ``keyvaluestore queue max ops`` :Description: Defines the maximum number of operations in progress the ``KeyValueStore`` accepts before blocking on queuing new operations. :Type: Integer :Required: No. Minimal impact on performance. :Default: ``50`` ``keyvaluestore queue max bytes`` :Description: The maximum number of bytes for an operation. :Type: Integer :Required: No :Default: ``100 << 20`` .. index:: keyvaluestore; thread Thread ======== ``keyvaluestore op threads`` :Description: The number of ``KeyValueStore`` operation threads that execute in parallel. :Type: Integer :Required: No :Default: ``2`` ``keyvaluestore op thread timeout`` :Description: The timeout for a ``KeyValueStore`` operation thread (in seconds). :Type: Integer :Required: No :Default: ``60`` ``keyvaluestore op thread suicide timeout`` :Description: The timeout for a commit operation before canceling the commit (in seconds). :Type: Integer :Required: No :Default: ``180`` Misc ==== ``keyvaluestore default strip size`` :Description: Each object will be split into multiple key/value pairs and stored in the backend. **Note:** The size of the workload has a significant impact on performance. :Type: Integer :Required: No :Default: ``4096`` ``keyvaluestore header cache size`` :Description: The size of the header cache (identical to ``inode`` in the local filesystem). A larger cache size enhances performance. :Type: Integer :Required: No :Default: ``4096``