+ since the speed may be different. It is possible to specify
+ a number of IO's to do before getting a new offset - this
+ is only useful for random IO, where fio would normally
+ generate a new random offset for every IO. If you append
+ eg 8 to randread, you would get a new random offset for
+ every 8 IO's. The result would be a seek for only every 8
+ IO's, instead of for every IO. Use rw=randread:8 to specify
+ that.
+
+kb_base=int The base unit for a kilobyte. The defacto base is 2^10, 1024.
+ Storage manufacturers like to use 10^3 or 1000 as a base
+ ten unit instead, for obvious reasons. Allow values are
+ 1024 or 1000, with 1024 being the default.
+
+randrepeat=bool For random IO workloads, seed the generator in a predictable
+ way so that results are repeatable across repetitions.
+
+fadvise_hint=bool By default, fio will use fadvise() to advise the kernel
+ on what IO patterns it is likely to issue. Sometimes you
+ want to test specific IO patterns without telling the
+ kernel about it, in which case you can disable this option.
+ If set, fio will use POSIX_FADV_SEQUENTIAL for sequential
+ IO and POSIX_FADV_RANDOM for random IO.
+
+size=int The total size of file io for this job. Fio will run until
+ this many bytes has been transferred, unless runtime is
+ limited by other options (such as 'runtime', for instance).
+ Unless specific nrfiles and filesize options are given,
+ fio will divide this size between the available files
+ specified by the job.
+
+filesize=int Individual file sizes. May be a range, in which case fio
+ will select sizes for files at random within the given range
+ and limited to 'size' in total (if that is given). If not
+ given, each created file is the same size.
+
+fill_device=bool Sets size to something really large and waits for ENOSPC (no
+ space left on device) as the terminating condition. Only makes
+ sense with sequential write. For a read workload, the mount
+ point will be filled first then IO started on the result.
+
+blocksize=int
+bs=int The block size used for the io units. Defaults to 4k. Values
+ can be given for both read and writes. If a single int is
+ given, it will apply to both. If a second int is specified
+ after a comma, it will apply to writes only. In other words,
+ the format is either bs=read_and_write or bs=read,write.
+ bs=4k,8k will thus use 4k blocks for reads, and 8k blocks
+ for writes. If you only wish to set the write size, you
+ can do so by passing an empty read size - bs=,8k will set
+ 8k for writes and leave the read default value.
+
+blockalign=int
+ba=int At what boundary to align random IO offsets. Defaults to
+ the same as 'blocksize' the minimum blocksize given.
+ Minimum alignment is typically 512b for using direct IO,
+ though it usually depends on the hardware block size. This
+ option is mutually exclusive with using a random map for
+ files, so it will turn off that option.
+
+blocksize_range=irange