[PATCH] Offset verification header by a user-specified distance

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index b862d74acac192f239131a7a5dfb096b5e04c7cb..8cb849c7c6edad0ddf70294d98f3084cd2894a5a 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -602,6 +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.
+
+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