[Gluster-users] Very slow performance on Sharded GlusterFS

[gencer at gencgiyen.com]

Hi,

 

I want to give an update for this. I also tested READ speed. It seems, sharded volume has a lower read speed than striped volume.

 

This machine has 24 cores with 64GB of RAM . I really don’t think its caused due to low system. Stripe is kind of a shard but a fixed size based on stripe value / filesize. Hence, I would expect at least the same speed or maybe little slower. What I get is 5-10x slower.

 

I play with Gluster’s threads count, performance tweaks, caches and etc. Nothing helped. In fact, the performance tweaks that I apply for stripe makes sharded volume much much more worse. Default values are better on sharded volume.

 

-Gencer.

 

From: gencer at gencgiyen.com [mailto:gencer at gencgiyen.com] 
Sent: Saturday, July 1, 2017 9:49 AM
To: 'Gandalf Corvotempesta' <gandalf.corvotempesta at gmail.com>
Cc: 'Krutika Dhananjay' <kdhananj at redhat.com>; 'gluster-user' <gluster-users at gluster.org>
Subject: RE: [Gluster-users] Very slow performance on Sharded GlusterFS

 

I did the changes (one brick from 09th server and one replica from 10th server and continued with this order) and re-test. Nothing changed. Still slow. (exactly same result.)

 

-Gencer.

 

From: Gandalf Corvotempesta [mailto:gandalf.corvotempesta at gmail.com] 
Sent: Friday, June 30, 2017 8:19 PM
To: gencer at gencgiyen.com <mailto:gencer at gencgiyen.com> 
Cc: Krutika Dhananjay <kdhananj at redhat.com <mailto:kdhananj at redhat.com> >; gluster-user <gluster-users at gluster.org <mailto:gluster-users at gluster.org> >
Subject: Re: [Gluster-users] Very slow performance on Sharded GlusterFS

 

Il 30 giu 2017 3:51 PM, <gencer at gencgiyen.com <mailto:gencer at gencgiyen.com> > ha scritto:

Note: I also noticed that you said “order”. Do you mean when we create via volume set we have to make an order for bricks? I thought gluster handles (and  do the math) itself.

Yes, you have to specify the exact order

Gluster is not flexible in this way and doesn't help you at all.

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