[one-users] Ceph and thin provision

[Mario Giammarco]

In several virtualization systems you can have a virtual disk drive:

-thick, so a thick disk of 100gb uses 100gb of space;
-thin,  so a thin disk of 100gb uses 0gb when empty and starts using space
when the virtual machine fills it.

So I can have a real hdd of 250gb with inside ten virtual thin disks of
1000gb each, if they are almost empty.

I have checked again and ceph rbd are "thin".

BTW: I thank you for you explanation of persistent/not persistent, I was
not able to find it in docs. Can you explain me also what a "volatile disk"
is?
A not persistent image is writeable?
When you reboot a vm with a not persistent image you lose all datda written
to it?

Thanks again,
Mario


2013/12/12 Kenneth <kenneth at apolloglobal.net>

>  Hi,
>
> Can you elaborate more on what you want to achieve?
>
> If you have a 100GB image and it is set to persistent, you can instantiate
> that image immediately and deploy/live migrate it to any nebula node. Only
> one running instance of VM of this image is allowed.
>
> If it is a 100GB non persistent image, you'll have to wait for ceph to
> "create a copy" of it once you deploy it. But you can use this image
> multiple times simutaneously.
> ---
>
> Thanks,
> Kenneth
> Apollo Global Corp.
>
>  On 12/11/2013 07:28 PM, Mario Giammarco wrote:
>
>   Hello,
> I am using ceph with opennebula.
> I have created a 100gb disk image and I do not understand if it is thin or
> thick.
>
> I hope I can have thin provision.
>
> Thanks,
> Mario
>
> _______________________________________________
> Users mailing listUsers at lists.opennebula.orghttp://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>
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