[PATCH] Add verify_meta verification type

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index b862d74acac192f239131a7a5dfb096b5e04c7cb..c38266c2afe100fcf02106476c3ae52eb05e4ae1 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.
 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,
 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,


@@ -587,6 +588,14 @@ 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.
 
                        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.
+

                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much
                                else.
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much
                                else.


@@ -602,6 +611,23 @@ verifysort=bool    If set, fio will sort written verify blocks when it deems
                can ignore this option unless doing huge amounts of really
                fast IO where the red-black tree sorting CPU time becomes
                significant.
                can ignore this option unless doing huge amounts of really
                fast IO where the red-black tree sorting CPU time becomes
                significant.

+
+verify_offset=siint    Swap the verification header with data somewhere else
+                       in the block before writing. Its swapped back before
+                       verifying.
+
+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_pattern=int     If set, fio will fill the io buffers with this
+               pattern. Fio defaults to filling with totally random
+               bytes, but sometimes it's interesting to fill with a known
+               pattern for io verification purposes. Depending on the
+               width of the pattern, fio will fill 1/2/3/4 bytes of the
+               buffer at the time. The verify_pattern cannot be larger than
+               a 32-bit quantity.

                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization