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From Edison Su <Edison...@citrix.com>
Subject RE: Local storage support for data volumes
Date Thu, 02 Aug 2012 20:04:47 GMT


> -----Original Message-----
> From: Nitin Mehta [mailto:Nitin.Mehta@citrix.com]
> Sent: Thursday, August 02, 2012 8:18 AM
> To: cloudstack-dev@incubator.apache.org
> Subject: RE: Local storage support for data volumes
> 
> David - I think the cluster is supposed to be homogeneous in terms of
> hardware and hypervisor version and selectively having local storage
> for hosts shouldn't be a problem. Allocation also looks at cluster to
> have a rough idea if the vm can be accommodated or not.
> Since the local storage is tied at the host level I wanted to find
> community's viewpoint if we want the flexibility at the lowest level or
> not.

Local storage is per host, not per cluster, and it's not created by cloudstack mgt server.
If admin doesn't want local storage for a particular host, he can disable it during hypervisor
host installation or setup.
What's the usage case to put the local storage at zone/cluster level?
 
> 
> But then on second thought I myself don't see a lot of merit of having
> this flexibility at the host level at the moment and it might become
> little tedious for the admin to disable local storage.
> Another concern is that if you have the flag at cluster/zone level then
> how would you enable it on the fly - would you be creating local
> storages for all the hosts within that cluster/zone ? Has that been
> addressed ?
> 
> Thanks,
> -Nitin
> 
> -----Original Message-----
> From: David Nalley [mailto:david@gnsa.us]
> Sent: Thursday, August 02, 2012 5:22 PM
> To: cloudstack-dev@incubator.apache.org
> Subject: Re: Local storage support for data volumes
> 
> On Tue, Jul 31, 2012 at 5:34 AM, Nitin Mehta <Nitin.Mehta@citrix.com>
> wrote:
> > Can we not  provide the flexibility while adding a host. So when the
> admin adds a host he has the provision of enabling/disabling local
> storage for that host. I think that is the lowest level of granularity
> that we can provide to the admin ?
> 
> But hosts within a cluster are supposed to be homogenous. And aren't
> allocation planning decisions made at the cluster level? What benefit
> do you see by making this specific to the host as opposed to the
> cluster?
> 
> --David

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