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From Edison Su <Edison...@citrix.com>
Subject RE: [DISCUSS] Shared NFS Zone-wide (primary) Block Storage
Date Thu, 03 Jan 2013 18:04:04 GMT


> -----Original Message-----
> From: David Nalley [mailto:david@gnsa.us]
> Sent: Thursday, January 03, 2013 7:31 AM
> To: cloudstack-dev@incubator.apache.org
> Subject: Re: [DISCUSS] Shared NFS Zone-wide (primary) Block Storage
> 
> On Wed, Jan 2, 2013 at 6:27 PM, Hari Kannan <hari.kannan@citrix.com>
> wrote:
> >
> > Hello All,
> >
> > I wish to propose Shared NFS Zone-wide (primary) Block Storage
> > CloudStack - I have added some details here
> >
> (https://cwiki.apache.org/confluence/display/CLOUDSTACK/Shared+NFS+Zo
> n
> > e-wide+(primary)+Block+Storage)  along with a JIRA ticket 724
> >
> > Please review and comment
> >
> > Hari Kannan
> 
> So I have to say that I don't really understand the reason for wanting to
> invest the effort in doing this, and fear it will just result in a bad experience
> for the majority of folks who embark upon it.
> For a small setup this will work fine, but that small setup is also likely to only
> have a few clusters. I fear that in all but the most niche cases that this simply
> doesn't scale.

It's not about shared nfs zone-wide primary storage, it is about: can we support zone-wide
primary storage in cloudstack? Don't matter what kind of primary storage people want to use,
it can be nfs(if they want, for whatever reason), or solidfire etc.
Currently, cloudstack just can't do that.

> 
> Also - trying to emulate Amazon's EBS with something like NFS that is unlikely
> to scale to EBS proportions seems an interesting choice. I could understand
> using one of the distributed filesystems like Gluster or Ceph to do this, so
> why NFS?

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