Re: [Gluster-devel] [Gluster-users] PLEASE READ ! We need your opinion. GSOC-2014 and the Gluster community

[Dan Lambright]

I had a chat with Carlos on this subject (#3) the other day, from my point of 
view it was very interesting to have a look at how Isilon leverages new backend 
storage technologies. Ceph is of course making claims in this area as well.  So 
we (gluster) do indeed need to make some progress in this area. I think the 
reason you do not see a formal project in this space is we are just starting to 
research how to use SSDs (put meta-data/change logs in them?) and we need to 
get proof of concepts underway. There have been some early performance tests 
with mixed results. 

Note there is a "data classification/tiering" project underway, which (I 
believe) will place data according to rules. This dovetails nicely with SSDs as 
data could be placed on fast or slow memory according to configuration. You may 
even consider that a step forward in support for SSDs.

I think RAM disks as a stand-in for SSDs is a good way to prototype ideas - 
particularly as tmpfs supports attributes as you pointed out when we chatted. 
People in the gluster family may want to consider that as a testing approach, 
and broadcast to the mailing list or blog their findings :)

----- Original Message -----
From: "Sabuj Pattanayek" <address@hidden>
To: "Jeff Darcy" <address@hidden>
Cc: "Carlos Capriotti" <address@hidden>, "gluster-users Discussion List" 
<address@hidden>, "Gluster Devel" <address@hidden>
Sent: Thursday, March 13, 2014 9:12:30 AM
Subject: Re: [Gluster-devel] [Gluster-users] PLEASE READ ! We need your 
opinion. GSOC-2014 and the Gluster community

has the 32 group limit been fixed yet? If not how about that :) ? 
https://bugzilla.redhat.com/show_bug.cgi?id=789961 


On Thu, Mar 13, 2014 at 8:01 AM, Jeff Darcy < address@hidden > wrote: 



> 3) Accelerator node project. Some storage solutions out there offer an 
> "accelerator node", which is, in short, a, extra node with a lot of RAM, 
> eventually fast disks (SSD), and that works like a proxy to the regular 
> volumes. active chunks of files are moved there, logs (ZIL style) are 
> recorded on fast media, among other things. There is NO active project for 
> this, or trello entry, because it is something I started discussing with a 
> few fellows just a couple of days ago. I thought of starting to play with 
> RAM disks (tmpfs) as scratch disks, but, since we have an opportunity to do 
> something more efficient, or at the very least start it, why not ? 

Looks like somebody has read the Isilon marketing materials. ;) 

A full production-level implementation of this, with cache consistency and 
so on, would be a major project. However, a non-consistent prototype good 
for specific use cases - especially Hadoop, as Jay mentions - would be 
pretty easy to build. Having a GlusterFS server (for the real clients) 
also be a GlusterFS client (to the real cluster) is pretty straightforward. 
Testing performance would also be a significant component of this, and IMO 
that's something more developers should learn about early in their careers. 
I encourage you to keep thinking about how this could be turned into a real 
GSoC proposal. 


Keep the ideas coming! 
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