Hi, Currently we can’t vary % of compressible data from block to block (as far as I know). The value provided for buffer_compress_percentage is used for all blocks. """ buffer_compress_percentage=int If this is set, then fio will attempt to provide I/O buffer content (on WRITEs) that compresses to the specified level. Fio does this by providing a mix of random data followed by fixed pattern data. """ As we have a requirement to test with random compression %, we modified the code to accept a range of values for buffer_compress_percentage instead of one number so that the percentage changes from block to block – random value between min and max. Not sure if it’s useful for others; if so, will send the patch for review. Thanks, --Sunil
