Update 'overwrite' option documentation

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index bbf5715ae229f0830d2195308ca2249256fed706..32e7322cdc5155d3d6c2a1bf7875acbcd0cb7c2c 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -454,7 +454,11 @@ fsync=int  If writing to a file, issue a sync of the dirty data
                not sync the file. The exception is the sg io engine, which
                synchronizes the disk cache anyway.
 
-overwrite=bool If writing to a file, setup the file first and do overwrites.
+overwrite=bool If true, writes to a file will always overwrite existing
+               data. If the file doesn't already exist, it will be
+               created before the write phase begins. If the file exists
+               and is large enough for the specified write phase, nothing
+               will be done.
 
 end_fsync=bool If true, fsync file contents when the job exits.