Re: [dm-devel] Problem when creating snashots

[The MoonSeeker <themoonseeker gmail com>]

Yes I really need it. I have to create a virtual network editor for  
my diploma project. So I have found many virtual solutions but the  
bestest for our project is OpenVZ. Unfortunatly, OpenVZ don't offer  
the copy on write with his solution, after many tests, I have found a  
solution based on LVM.

The main idea is to have a Virtual Private Server Core and lot of  
Virtual Private Server who are a snapshot of the Virtual Server Core.  
Now the problem is the limitation of VLM, I need more than 32 servers  
(32 snapshots). Will this limitation incresed in futur futur released  
of LVM? Or can we broke this limitation?

Have you a solution, it's relly urgent for me...

Thanks you


Le 26 sept. 06 à 23:14, Jan Blunck a écrit :

> On Tue, Sep 26, The MoonSeeker wrote:
>
> > I'd like to create many snaphot of an image but I've got when I
> > attemp to create the 32th snapshot :
> >
> > root B03:/diplome# lvcreate -s -L150M -n 232 /dev/openvz/vps-core
> >   Rounding up size to full physical extent 152.00 MB
> >   device-mapper: reload ioctl failed: Ne peut allouer de la mémoire
> >   Failed to suspend origin vps-core
> >
> > I don't understand the error..
>
> I'm not a native french speaker (hint!) but I assume you run out of
> memory.
>
> Yes there are limitations to the number of snapshots. For every single
> snapshot we have to allocate memory for copying the chunks to the  
> exception
> store.
>
> Do you really need that many snapshots at the same time?
>
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