Hello guys, we're using the latest stable 2.99GA FIO for our product testing , when trying to setup fio to write on ext4 mount we got a line that failing our code to load the json file . mt exe cmd: fio --verify=md5 --randrepeat 0 --direct=1 --rw write --thread=32 --exitall_on_error=1 --directory /mnt/v1 --verify_interval=4096 --buffered 0 --output-format=json --size 1M --iodepth 1 --name FioJob --rwmixread 100 --verify_dump=1 --norandommap --verify_fatal=1 --output /var/opt/executions/None/FioFS_f12f9c_1504448587_None.log --runtime 0 --fill_fs 0 --do_verify=1 --numjobs 20 --blocksize 4K --verify_pattern=0xaa --time_based=0 --ioengine libaio output file: Multiple writers may overwrite blocks that belong to other jobs. This can cause verification failures. { "fio version" : "fio-2.99-40-ga94a", "timestamp" : 1504449007, "timestamp_ms" : 1504449007643, "time" : "Sun Sep 3 17:30:07 2017", "global options" : { "verify" : "md5", "randrepeat" : "0", "direct" : "1", "rw" : "write", "thread" : "32".......... } I understated the message, but how can I avoid this line in the json output? it's breaking the json format -- Thanks, Udi-Yehuda Tamar. -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html