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: [email protected] [mailto:[email protected]] Sent: Saturday, July 1, 2017 9:49 AM To: 'Gandalf Corvotempesta' <[email protected]> Cc: 'Krutika Dhananjay' <[email protected]>; 'gluster-user' <[email protected]> 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:[email protected]] Sent: Friday, June 30, 2017 8:19 PM To: [email protected] <mailto:[email protected]> Cc: Krutika Dhananjay <[email protected] <mailto:[email protected]> >; gluster-user <[email protected] <mailto:[email protected]> > Subject: Re: [Gluster-users] Very slow performance on Sharded GlusterFS Il 30 giu 2017 3:51 PM, <[email protected] <mailto:[email protected]> > 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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