More option help updates

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 2fbbc1d2150e3e70a1512f83ea45b54c44c45977..21ba96033c283d0742f9191cc76ef97cf969277d 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,
@@ -587,6 +588,10 @@ 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.
+
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much
                                else.
@@ -611,6 +616,14 @@ 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