[PATCH] Add 'norandommap' option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index ae19834f84fccd56f86feab0c2a9abf0b99c897f..6d215ac5378db68e6406182f9ff4c8e21c8b7dfb 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -284,6 +284,13 @@ rwmixwrite=int     How large a percentage of the mix should be writes. If both
                up to 100%, the latter of the two will be used to override
                the first.
 
+norandommap    Normally fio will cover every block of the file when doing
+               random IO. If this option is given, fio will just get a
+               new random offset without looking at past io history. This
+               means that some blocks may not be read or written, and that
+               some blocks may be read/written more than once. This option
+               is mutually exclusive with verify= for that reason.
+
 nice=int       Run the job with the given nice value. See man nice(2).
 
 prio=int       Set the io priority value of this job. Linux limits us to