X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=4fd4da1471758c14808f1d545d33b2a267557b42;hb=839bea4f8e8f6cd00fb69028ae7a007643b53242;hp=95289040dd3fd58a0bb70dfb0a94fadf1475e175;hpb=1cb049d945600c0bcbb882b95afab9ac607e5613;p=fio.git

diff --git a/HOWTO b/HOWTO
index 95289040..4fd4da14 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1991,6 +1991,8 @@ I/O engine
 			Asynchronous read and write using DDN's Infinite Memory Engine (IME).
 			This engine will try to stack as much IOs as possible by creating
 			requests for IME. FIO will then decide when to commit these requests.
+		**libiscsi**
+			Read and write iscsi lun with libiscsi.
 
 I/O engine specific parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -2339,8 +2341,13 @@ I/O depth
 	``serialize_overlap`` tells fio to avoid provoking this behavior by explicitly
 	serializing in-flight I/Os that have a non-zero overlap. Note that setting
 	this option can reduce both performance and the :option:`iodepth` achieved.
-	Additionally this option does not work when :option:`io_submit_mode` is set to
-	offload. Default: false.
+
+	This option only applies to I/Os issued for a single job except when it is
+	enabled along with :option:`io_submit_mode`=offload. In offload mode, fio
+	will check for overlap among all I/Os submitted by offload jobs with :option:`serialize_overlap`
+	enabled.
+
+	Default: false.
 
 .. option:: io_submit_mode=str
 
@@ -2559,12 +2566,13 @@ I/O replay
 
 .. option:: replay_align=int
 
-	Force alignment of I/O offsets and lengths in a trace to this power of 2
-	value.
+	Force alignment of the byte offsets in a trace to this value. The value
+	must be a power of 2.
 
 .. option:: replay_scale=int
 
-	Scale sector offsets down by this factor when replaying traces.
+	Scale byte offsets down by this factor when replaying traces. Should most
+	likely use :option:`replay_align` as well.
 
 .. option:: replay_skip=str