[Gluster-users] Very slow performance on Sharded GlusterFS

[gencer at gencgiyen.com]

Hi,

 

I have an 2 nodes with 20 bricks in total (10+10).

 

First test: 

 

2 Nodes with Distributed - Striped - Replicated (2 x 2)

10GbE Speed between nodes

 

"dd" performance: 400mb/s and higher

Downloading a large file from internet and directly to the gluster:
250-300mb/s

 

Now same test without Stripe but with sharding. This results are same when I
set shard size 4MB or 32MB. (Again 2x Replica here)

 

Dd performance: 70mb/s

Download directly to the gluster performance : 60mb/s

 

Now, If we do this test twice at the same time (two dd or two doewnload at
the same time) it goes below 25/mb each or slower.

 

I thought sharding is at least equal or a little slower (maybe?) but these
results are terribly slow.

 

I tried tuning (cache, window-size etc..). Nothing helps.

 

GlusterFS 3.11 and Debian 9 used. Kernel also tuned. Disks are "xfs" and 4TB
each.

 

Is there any tweak/tuning out there to make it fast?

 

Or is this an expected behavior? If its, It is unacceptable. So slow. I
cannot use this on production as it is terribly slow. 

 

The reason behind I use shard instead of stripe is i would like to eleminate
files that bigger than brick size.

 

Thanks,

Gencer.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20170630/263735fe/attachment.html>