[linux-lvm] Sparse LVs, --virtualsize equal to --size

[Vangelis Koukis]

On Fri, Jan 25, 2013 at 12:29:22pm +0000, Alasdair G Kergon wrote:
> On Fri, Jan 25, 2013 at 10:44:10AM +0200, Vangelis Koukis wrote:
> > this seems to fit the bill perfectly, it's a shame it's
> > not yet merged upstream.
>  
> One of the reasons the zeroed  target is not upstream is because,
> although we thought it would be useful, we had nobody actually
> asking to test and use it.
> 
> If we bring it up-to-date and prepare to merge it upstream, would you 
> test it?
> 
> Alasdair

Dear Alasdair,

this functionality is really useful, especially in VM provisioning
scenarios.

The need for this feature came through our work on the Synnefo cloud
software [1].

We were already planning to contribute code to Ganeti [2],
so it can allocate sparse LVs based on the snapshot feature.
If the zeroed DM target makes it upstream, we'll implement support for
it inside Ganeti and also propose it for inclusion upstream.

Then I won't just be able to test it manually, we'll be running Ganeti
burnin against it, and the number of potential testers will include
users currently running Ganeti and Synnefo in production.

Thanks,
Vangelis.

[1] http://www.synnefo.org
[2] http://code.google.com/p/ganeti

-- 
Vangelis Koukis
vkoukis at grnet.gr
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