Fio 1.17.1

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 8cb849c7c6edad0ddf70294d98f3084cd2894a5a..6ece3c183ae473cd7de3cc4f95e733de6ca888be 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -170,7 +170,8 @@ Some parameters take an option of a given type, such as an integer or
 a string. The following types are used:
 
 str    String. This is a sequence of alpha characters.
-int    Integer. A whole number value, can be negative.
+int    Integer. A whole number value, can be negative. If prefixed with
+       0x, the integer is assumed to be of base 16 (hexidecimal).
 siint  SI integer. A whole number value, which may contain a postfix
        describing the base of the number. Accepted postfixes are k/m/g,
        meaning kilo, mega, and giga. So if you want to specify 4096,
@@ -568,6 +569,9 @@ loops=int   Run the specified number of iterations of this job. Used
                to repeat the same workload a given number of times. Defaults
                to 1.
 
+do_verify=bool Run the verify phase after a write phase. Only makes sense if
+               verify is set. Defaults to 1.
+
 verify=str     If writing to a file, fio can verify the file contents
                after each iteration of the job. The allowed values are:
 
@@ -587,6 +591,23 @@ verify=str If writing to a file, fio can verify the file contents
                        crc7    Use a crc7 sum of the data area and store
                                it in the header of each block.
 
+                       sha512  Use sha512 as the checksum function.
+
+                       sha256  Use sha256 as the checksum function.
+
+                       meta    Write extra information about each io
+                               (timestamp, block number etc.). The block
+                               number is verified.
+
+                       pattern Fill the IO buffers with a specific pattern,
+                               that we can use to verify. Depending on the
+                               width of the pattern, fio will fill 1/2/3/4
+                               bytes of the buffer at the time. The pattern
+                               cannot be larger than a 32-bit quantity. The
+                               given pattern is given as a postfix to this
+                               option, ala: verify=pattern:0x5a. It accepts
+                               both hex and dec values.
+
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much
                                else.
@@ -603,14 +624,19 @@ verifysort=bool   If set, fio will sort written verify blocks when it deems
                fast IO where the red-black tree sorting CPU time becomes
                significant.
 
-header_offset=siint    Swap the verification header with data somewhere else
+verify_offset=siint    Swap the verification header with data somewhere else
                        in the block before writing. Its swapped back before
                        verifying.
 
-header_interval=siint  Write the verification header at a finer granularity
+verify_interval=siint  Write the verification header at a finer granularity
                        than the blocksize. It will be written for chunks the
                        size of header_interval. blocksize should divide this
                        evenly.
+
+verify_fatal=bool      Normally fio will keep checking the entire contents
+               before quitting on a block verification failure. If this
+               option is set, fio will exit the job on the first observed
+               failure.
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization