X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=7b717f7739664f44393d67b7b6521e8ca0404eae;hb=fc74ac1d749c977308016eb22c8658a9a5ac7989;hp=d5fb52cfb0f9f931db588c78d92e81a95480f2ca;hpb=046ee3021f5a8a951c41f6604341d26e74183df7;p=fio.git

diff --git a/HOWTO b/HOWTO
index d5fb52cf..7b717f77 100644
--- a/HOWTO
+++ b/HOWTO
@@ -262,6 +262,10 @@ filesize=siint	Individual file sizes. May be a range, in which case fio
 		and limited to 'size' in total (if that is given). If not
 		given, each created file is the same size.
 
+fill_device=bool Sets size to something really large and waits for ENOSPC (no
+		space left on device) as the terminating condition. Only makes
+                sense with sequential write.
+
 blocksize=siint
 bs=siint	The block size used for the io units. Defaults to 4k. Values
 		can be given for both read and writes. If a single siint is
@@ -281,6 +285,30 @@ bsrange=irange	Instead of giving a single block size, specify a range
 		writes, however a second range can be given after a comma.
 		See bs=.
 
+bssplit=str	Sometimes you want even finer grained control of the
+		block sizes issued, not just an even split between them.
+		This option allows you to weight various block sizes,
+		so that you are able to define a specific amount of
+		block sizes issued. The format for this option is:
+
+			bssplit=blocksize/percentage:blocksize/percentage
+
+		for as many block sizes as needed. So if you want to define
+		a workload that has 50% 64k blocks, 10% 4k blocks, and
+		40% 32k blocks, you would write:
+
+			bssplit=4k/10:64k/50:32k/40
+
+		Ordering does not matter. If the percentage is left blank,
+		fio will fill in the remaining values evenly. So a bssplit
+		option like this one:
+
+			bssplit=4k/50:1k/:32k/
+
+		would have 50% 4k ios, and 25% 1k and 32k ios. The percentages
+		always add up to 100, if bssplit is given a range that adds
+		up to more, it will error out.
+
 blocksize_unaligned
 bs_unaligned	If this option is given, any byte size value within bsrange
 		may be used as a block range. This typically wont work with