zero_buffers If this option is given, fio will init the IO buffers to
all zeroes. The default is to fill them with random data.
+refill_buffers If this option is given, fio will refill the IO buffers
+ on every submit. The default is to only fill it at init
+ time and reuse that data. Only makes sense if zero_buffers
+ isn't specified, naturally.
+
nrfiles=int Number of files to use for this job. Defaults to 1.
openfiles=int Number of files to keep open at the same time. Defaults to
not sync the file. The exception is the sg io engine, which
synchronizes the disk cache anyway.
-overwrite=bool If writing to a file, setup the file first and do overwrites.
+overwrite=bool If true, writes to a file will always overwrite existing
+ data. If the file doesn't already exist, it will be
+ created before the write phase begins. If the file exists
+ and is large enough for the specified write phase, nothing
+ will be done.
end_fsync=bool If true, fsync file contents when the job exits.
This differs from end_fsync in that it will happen on every
file close, not just at the end of the job.
-rwmixcycle=int Value in milliseconds describing how often to switch between
- reads and writes for a mixed workload. The default is
- 500 msecs.
-
rwmixread=int How large a percentage of the mix should be reads.
rwmixwrite=int How large a percentage of the mix should be writes. If both