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• DiskSyncSize 

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This is the maximum number of bytes to store before flushing data to a local checkpoint file. This is done to prevent write buffering, which can impede performance significantly. This parameter is not  intended to take the place of TimeBetweenLocalCheckpoints . 

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The default value is 4M (4 megabytes). 

• MaxDiskWriteSpeed 

## Note 

When ODirect  is enabled, it is not necessary to set DiskSyncSize ; in fact, in such cases its value is simply ignored. 

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Set the maximum rate for writing to disk, in bytes per second, by local checkpoints and backup operations when no restarts (by this data node or any other data node) are taking place in this NDB Cluster. 

For setting the maximum rate of disk writes allowed while this data node is restarting, use MaxDiskWriteSpeedOwnRestart . For setting the maximum rate of disk writes allowed while other data nodes are restarting, use MaxDiskWriteSpeedOtherNodeRestart . The minimum speed for disk writes by all LCPs and backup operations can be adjusted by setting MinDiskWriteSpeed . 

• MaxDiskWriteSpeedOtherNodeRestart 

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Set the maximum rate for writing to disk, in bytes per second, by local checkpoints and backup operations when one or more data nodes in this NDB Cluster are restarting, other than this node. 

For setting the maximum rate of disk writes allowed while this data node is restarting, use MaxDiskWriteSpeedOwnRestart . For setting the maximum rate of disk writes allowed when no data 

