Update 'overwrite' option documentation

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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.
 
                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.
 
 
 end_fsync=bool If true, fsync file contents when the job exits.