Add 'sequential' file_service_type

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index f256f24fde3a28cd20e7a25786ec6481f766b305..b8a7dd74bae68d207466c6a672da818f5238215a 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -387,6 +387,10 @@ file_service_type=str  Defines how fio decides which file from a job to
                        roundrobin  Round robin over open files. This
                                is the default.
 
+                       sequential  Finish one file before moving on to
+                               the next. Multiple files can still be
+                               open depending on 'openfiles'.
+
                The string can have a number appended, indicating how
                often to switch to a new file. So if option random:4 is
                given, fio will switch to a new random file after 4 ios
@@ -532,9 +536,9 @@ norandommap Normally fio will cover every block of the file when doing
                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, since
-               fio doesn't track potential block rewrites which may alter
-               the calculated checksum for that block.
+               is mutually exclusive with verify= if and only if multiple
+               blocksizes (via bsrange=) are used, since fio only tracks
+               complete rewrites of blocks.
 
 softrandommap  See norandommap. If fio runs with the random block map enabled
                and it fails to allocate the map, if this option is set it