Open Stack

We run GFS2 for our shared instances volume and it has worked very well for us.  We leverage CLVM and fiber connected SAN LUNs on the backend in order to do that.  It's great for live migrations, etc.

I'm told that GFS2 performance degrades significantly once you mount the filesystem on more than about 16 nodes.   We are planning on moving to GlusterFS or Ceph in the future for a couple of reasons:

- Ceph and Cluster scale-out more linearly
- We want to use more commodity-type hardware in remote data centers
- We don't any want cluster/quorum related issues to take down the shared storage



Mike Smith
Principal Engineer, Website Systems
Overstock.com


________________________________
From: yasith tharindu [yasithucsc at gmail.com]
Sent: Thursday, September 18, 2014 4:06 AM
To: Robert van Leeuwen
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] What is the best network architecture for Openstack

Thanks for the reply Robert;

Does GFS is stable now ? Are there Openstack production setups runs with GFS?

On Thu, Sep 18, 2014 at 12:17 PM, Robert van Leeuwen <Robert.vanLeeuwen at spilgames.com<mailto:Robert.vanLeeuwen at spilgames.com>> wrote:
> We have four servers and one SAS data store for the openstack deployment. All servers have SAS
> interfaces. We are going to put one controller node and 3 compute nodes. We need to run the system with
> live migration enabled.
>
> Is there are other options available to use the Compute nodes SAS interfaces too but live migration needed also
> enabled.

The only way to directly access the same data on the SAS data store would be by running a clustered filesystem. (e.g. GFS)
Clustered filesystems are quite a bit more complex then regular filesystems so I'm not sure if that would be the preferred route though.


Cheers,
Robert van Leeuwen









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