[Gluster-users] increase write performance in gfs 3.5.2

Rafi K C muhammedrafi13 at gmail.com
Sun Feb 8 11:04:56 UTC 2015

On Sat, 2015-02-07 at 20:41 +0100, Peter Prusi wrote:
> Hello,
> I'm new to glusterfs and I dont understand 'the 
> performance.write-behind-window-size' option. I'm using glusterfs 3.5.2 
> and setup a volume over two nodes connected over 1 GbE.
> Actually the write performance is about 58 Mb/s. This means glusterfs 
> writes the data simultaneous on both nodes. I'm trying to increase the 
> write speed and I thought this option would cache the data
> on one node and then distribute to the other. So i could double the 
> speed. I played around with this option, but it has no effect to the 
> write speed.

Write-behind does three jobs with respect to a write-request. One among
them is,

it will lie to application, which issued the write-request about the
completion of write and then will perform this write operation in
background. Basically, For a single inode, it will lie to the
application until current size of the total lied request which are not
fulfilled on nodes becomes equal to the window size. This size is
configurable through performance.write-behind-window-size . 

> What am I doing wrong or 
> is there another tweak to increase the write 
> speed ? 

I'm not familiar with write performance tweaks. Some one more familiar
with this can comment on this.

Rafi KC
> Thank you
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