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From "Lotic Lists" <li...@lotic.com.br>
Subject RE: Volume snapshot and primary storage space
Date Tue, 06 Jun 2017 15:58:32 GMT
Hi Syed

It's about volume snapshot, not VM snapshot

No, I seeing one VDI per volume snapshot (latest snapshot), but that VDIs have a virtual space
equal to original volume. XenServer use virtual space on Used space on SR.

XenCenter: 2977.9 GB used of 3072 GB total (2071.7 GB allocated)

2977.9 is used space including VMs VDIs and latest VIDs of snapshots, 2071.7 is the space
of VMs VDIs.

Can ACS erase VDI of volume snapshot on Primary Storage after VHD transferred to Secondary
Storage? Just for release space for new VMs. We use DataCore SDS, the price of TB is expensive
😊



-----Original Message-----
From: Syed Ahmed [mailto:sahmed@cloudops.com] 
Sent: terça-feira, 6 de junho de 2017 11:39
To: dev@cloudstack.apache.org
Subject: Re: Volume snapshot and primary storage space

Are you talking about base and the snapshot image? When XenServer takes a snapshot, it creates
a base image and then creates a new CoW layer on top of it where new writes go. Are you seeing
more than 2 VDIs?

On Tue, Jun 6, 2017 at 10:04 AM, Lotic Lists <lists@lotic.com.br> wrote:

> Hi team
>
>
>
> I have a doubt, why ACS allocate primary storage for latest snapshot 
> VDI of a volume?
>
> The snapshot was transferred to secondary storage but continued on primary.
> This is a problem because it uses space of SR (XenServer).
>
>
>
> Physical space of snapshot is not a problem, the VDI have 211K on 
> primary storage, but virtual space have original size of volume.
>
> It's a waste of space, especially when storage is space-licensed
>
>
>
> A friend answered me: the last snapshot is required to take any future 
> snapshots, that is the reason it stays on primary store
>
>
>
> How community see that?
>
>
>
> Regards.
>
> Marcelo
>
>


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