Hello,
first of all, thank you very much. It works very well. I would be
grateful if you could add this option to the next fio release.
Thanks,
Nikolaus
Am 14.04.2014 22:11, schrieb Jens Axboe:
On 04/14/2014 06:40 AM, Nikolaus Jeremic wrote:
Hello,
how can I nudge fio to write a certain amount of data (less than
capacity of block device) to randomly generated offsets covering the
whole address space of a block device (e.g. MD RAID device)?
Using the size parameter yields offsets from 0 to size (thus, not
covering the whole address range). Using a time based job leads to the
desired result, but I would like two write a defined amount of data. I
have already tried this with fio 2.0.14, 2.1.6.1, 2.1.17, and 2.1.18
without success. I am using Gentoo Linux with kernel 3.13.6 and libaio
0.3.109. The job description looks as follows:
Fio doesn't currently support that. Can you try the attached? It adds an
option to separately define an io limit, io_limit. If io_limit is not
set, size= behaves as it did before: if you don't give a size, size is
defined by the files added. With this patch, if you do
filename=/dev/md9
size=40g
fio would read 40g between 0..40G
If you do:
filename=/dev/md9
fio would access the entire device.
If you do:
filename=/dev/md9
io_limit=10g
fio would access the entire device, quit when 10G of IO was done. Etc.
--
Dipl.-Inf. Nikolaus Jeremic nikolaus.jeremic@xxxxxxxxxxxxxx
Universitaet Rostock Tel: (+49) 381 / 498 - 7635
Albert-Einstein-Str. 22 Fax: (+49) 381 / 498 - 7482
18059 Rostock, Germany wwwava.informatik.uni-rostock.de
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