First snapshot of FIO for Windows

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index d3639fb487d2c3fa206b1789ad59132e12e83e0c..3b1eeb0606832a7808b43c309673079b3303d11f 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -271,12 +271,14 @@ filename=str      Fio normally makes up a filename based on the job name,
                can specify a number of files by separating the names with a
                ':' colon. So if you wanted a job to open /dev/sda and /dev/sdb
                as the two working files, you would use
-               filename=/dev/sda:/dev/sdb. If the wanted filename does need to
-               include a colon, then escape that with a '\' character. For
-               instance, if the filename is "/dev/dsk/foo@3,0:c", then you would
-               use filename="/dev/dsk/foo@3,0\:c". '-' is a reserved name,
-               meaning stdin or stdout. Which of the two depends on the read/write
-               direction set.
+               filename=/dev/sda:/dev/sdb. On Windows, disk devices are accessed
+               as /dev/sda for the first device (i.e. \Device\HardDisk0\Partition0,
+               /dev/sda1 for the first partition on the first disk etc.  If the 
+               wanted filename does need to include a colon, then escape that with 
+               a '\' character. For instance, if the filename is 
+               "/dev/dsk/foo@3,0:c", then you would use filename="/dev/dsk/foo@3,0\:c". 
+               '-' is a reserved name, meaning stdin or stdout. Which of the 
+               two depends on the read/write direction set.
 
 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
@@ -492,6 +494,8 @@ ioengine=str        Defines how the job issues io to the file. The following
 
                        solarisaio Solaris native asynchronous io.
 
+                       windowsaio Windows native asynchronous io.
+
                        mmap    File is memory mapped and data copied
                                to/from using memcpy(3).
 
@@ -549,7 +553,14 @@ ioengine=str       Defines how the job issues io to the file. The following
 iodepth=int    This defines how many io units to keep in flight against
                the file. The default is 1 for each file defined in this
                job, can be overridden with a larger value for higher
-               concurrency.
+               concurrency. Note that increasing iodepth beyond 1 will not
+               affect synchronous ioengines (except for small degress when
+               verify_async is in use). Even async engines my impose OS
+               restrictions causing the desired depth not to be achieved.
+               This may happen on Linux when using libaio and not setting
+               direct=1, since buffered IO is not async on that OS. Keep an
+               eye on the IO depth distribution in the fio output to verify
+               that the achieved depth is as expected. Default: 1.
 
 iodepth_batch_submit=int
 iodepth_batch=int This defines how many pieces of IO to submit at once.
@@ -935,13 +946,18 @@ verify_backlog=int        Fio will normally verify the written contents of a
                associated with an IO block in memory, so for large
                verify workloads, quite a bit of memory would be used up
                holding this meta data. If this option is enabled, fio
+               will write only N blocks before verifying these blocks.
+
                will verify the previously written blocks before continuing
                to write new ones.
 
 verify_backlog_batch=int       Control how many blocks fio will verify
                if verify_backlog is set. If not set, will default to
                the value of verify_backlog (meaning the entire queue
-               is read back and verified).
+               is read back and verified).  If verify_backlog_batch is
+               less than verify_backlog then not all blocks will be verified,
+               if verify_backlog_batch is larger than verify_backlog, some
+               blocks will be verified more than once.
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization
@@ -1287,4 +1303,4 @@ Split up, the format is as follows:
        IO latencies milliseconds: <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, 2000, >=2000
        Additional Info (dependant on continue_on_error, default off): total # errors, first error code 
        
-       Additional Info (dependant on description being set): Text description
\ No newline at end of file
+       Additional Info (dependant on description being set): Text description