X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=16c5ae3163074fcb08a6caca741cb78a0b56c29b;hb=a94aedbc11829470cce77eb52969601d618054d6;hp=70eed2805c2d96811d4238afaed645f4f3a10e45;hpb=bf0b7e75c1ccca4026c8880ed8a76fc7ef85f2f3;p=fio.git

diff --git a/HOWTO b/HOWTO
index 70eed280..16c5ae31 100644
--- a/HOWTO
+++ b/HOWTO
@@ -991,13 +991,15 @@ I/O type
 		**write**
 				Sequential writes.
 		**trim**
-				Sequential trims (Linux block devices only).
+				Sequential trims (Linux block devices and SCSI
+				character devices only).
 		**randread**
 				Random reads.
 		**randwrite**
 				Random writes.
 		**randtrim**
-				Random trims (Linux block devices only).
+				Random trims (Linux block devices and SCSI
+				character devices only).
 		**rw,readwrite**
 				Sequential mixed reads and writes.
 		**randrw**
@@ -1748,7 +1750,7 @@ I/O engine
 			ioctl, or if the target is an sg character device we use
 			:manpage:`read(2)` and :manpage:`write(2)` for asynchronous
 			I/O. Requires :option:`filename` option to specify either block or
-			character devices.
+			character devices. This engine supports trim operations.
 			The sg engine includes engine specific options.
 
 		**null**
@@ -2082,6 +2084,7 @@ with the caveat that when used on the command line, they must come after the
 	the force unit access (fua) flag. Default is 0.
 
 .. option:: sg_write_mode=str : [sg]
+
 	Specify the type of write commands to issue. This option can take three values:
 
 	**write**
@@ -2324,6 +2327,12 @@ I/O replay
 	replay, the file needs to be turned into a blkparse binary data file first
 	(``blkparse <device> -o /dev/null -d file_for_fio.bin``).
 
+.. option:: read_iolog_chunked=bool
+
+	Determines how iolog is read. If false(default) entire :option:`read_iolog`
+	will be read at once. If selected true, input from iolog will be read
+	gradually. Useful when iolog is very large, or it is generated.
+
 .. option:: replay_no_stall=bool
 
 	When replaying I/O with :option:`read_iolog` the default behavior is to