Fix bug in md5 calculation

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 3af491325d3324b69117cc946728d7cd23ab8060..8cb849c7c6edad0ddf70294d98f3084cd2894a5a 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -574,9 +574,19 @@ verify=str If writing to a file, fio can verify the file contents
                        md5     Use an md5 sum of the data area and store
                                it in the header of each block.
 
                        md5     Use an md5 sum of the data area and store
                                it in the header of each block.
 

+                       crc64   Use an experimental crc64 sum of the data
+                               area and store it in the header of each
+                               block.
+

                        crc32   Use a crc32 sum of the data area and store
                                it in the header of each block.
 
                        crc32   Use a crc32 sum of the data area and store
                                it in the header of each block.
 

+                       crc16   Use a crc16 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.
+

                        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.


@@ -592,6 +602,15 @@ 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.

+
+header_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
+                       than the blocksize. It will be written for chunks the
+                       size of header_interval. blocksize should divide this
+                       evenly.

                
 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


@@ -697,9 +716,10 @@ E          Thread exited, not reaped by main thread yet.
 _              Thread reaped.
 
 The other values are fairly self explanatory - number of threads
 _              Thread reaped.
 
 The other values are fairly self explanatory - number of threads

-currently running and doing io, rate of io since last check, and the estimated
-completion percentage and time for the running group. It's impossible to
-estimate runtime of the following groups (if any).
+currently running and doing io, rate of io since last check (read speed
+listed first, then write speed), and the estimated completion percentage
+and time for the running group. It's impossible to estimate runtime of
+the following groups (if any).

 
 When fio is done (or interrupted by ctrl-c), it will show the data for
 each thread, group of threads, and disks in that order. For each data
 
 When fio is done (or interrupted by ctrl-c), it will show the data for
 each thread, group of threads, and disks in that order. For each data