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Besides the fs= option, there are three other options you can use:
The thres= option set the threshold value ( between 1 to 255 ). A threshold denotes the compression level used by Cogofs. Cogofs compress file in 4K chunk, if the compressed chunk size is lower than the threshold value, that 4K chunk will be stored in non-compressed form. The default threshold value is 200.
The nc option is known as no compression. When set, all newly created files will be stored in non compressed format.
When safewrite option is enabled, Cogofs will force updating the internal data header to disk on every write request. This reduces the chance of data corruption due to disk or power failure but slows down the overall performance. This feature is disabled by default.