<div dir="ltr"><div><div><div>Thank you. And what are the other two jobs ?<br></div>I have set the write-behind-window-size to 500 Mb and wrote a 100 Mb file, but the speed is still the same.</div>Can you explain why ?<br><br></div>Regards</div><div class="gmail_extra"><br><div class="gmail_quote">2015-02-09 13:20 GMT+01:00 Peter P. <span dir="ltr"><<a href="mailto:peter.prusi@googlemail.com" target="_blank">peter.prusi@googlemail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Thank you. And what are the other two jobs ?<br></div>I have set the write-behind-window-size to 500 Mb and wrote a 100 Mb file, but the speed is still the same.</div>Can you explain why ?<br><br></div>Regards<span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888">Peter<br><div><div><div><div><span></span></div></div></div></div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">2015-02-08 12:04 GMT+01:00 Rafi K C <span dir="ltr"><<a href="mailto:muhammedrafi13@gmail.com" target="_blank">muhammedrafi13@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>On Sat, 2015-02-07 at 20:41 +0100, Peter Prusi wrote:<br>
> Hello,<br>
><br>
> I'm new to glusterfs and I dont understand 'the<br>
> performance.write-behind-window-size' option. I'm using glusterfs 3.5.2<br>
> and setup a volume over two nodes connected over 1 GbE.<br>
> Actually the write performance is about 58 Mb/s. This means glusterfs<br>
> writes the data simultaneous on both nodes. I'm trying to increase the<br>
> write speed and I thought this option would cache the data<br>
> on one node and then distribute to the other. So i could double the<br>
> speed. I played around with this option, but it has no effect to the<br>
> write speed.<br>
<br>
</span>Write-behind does three jobs with respect to a write-request. One among<br>
them is,<br>
<br>
it will lie to application, which issued the write-request about the<br>
completion of write and then will perform this write operation in<br>
background. Basically, For a single inode, it will lie to the<br>
application until current size of the total lied request which are not<br>
fulfilled on nodes becomes equal to the window size. This size is<br>
configurable through performance.write-behind-window-size .<br>
<span><br>
<br>
> What am I doing wrong or<br>
> is there another tweak to increase the write<br>
> speed ?<br>
<br>
</span>I'm not familiar with write performance tweaks. Some one more familiar<br>
with this can comment on this.<br>
<br>
<br>
Regards<br>
Rafi KC<br>
><br>
> Thank you<br>
> _______________________________________________<br>
> Gluster-users mailing list<br>
> <a href="mailto:Gluster-users@gluster.org" target="_blank">Gluster-users@gluster.org</a><br>
> <a href="http://www.gluster.org/mailman/listinfo/gluster-users" target="_blank">http://www.gluster.org/mailman/listinfo/gluster-users</a><br>
<br>
<br>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>