Hi, basically the aggregate free space is relevant, as you mentioned you are having thin volumes, right?

On 08.11.19 07:18, Vrgotic, Marko wrote:
Hi Ladislav,

Not sure if you sam my reply, so i give it another shot.

I just want to he clear on understanding what you wrote in your recommendation.

Please check my previous reply.

Thank you.

Sent from my iPhone

On 6 Nov 2019, at 11:52, Vrgotic, Marko <M.Vrgotic@activevideo.com> wrote:

Hi Ladislav,


Thank you for the reply.


On the matter of your Recommendation, when you mention free space, were you referring to:

  • Space that is free/unallocated on the Aggregate, allowing the AutoGrow
  • Or all that is allocated to the volume but not actual Data Space


Kindly awaiting your reply.




kind regards/met vrindelijke groet


Marko Vrgotic



From: Ladislav Humenik <ladislav.humenik@ionos.com>
Date: Tuesday, 5 November 2019 at 20:45
To: "Vrgotic, Marko" <M.Vrgotic@activevideo.com>
Cc: "users@ovirt.org" <users@ovirt.org>
Subject: Re: [ovirt-users] Re: oVirt and Netapp question



for the NetApp part, here is copy-paste from the netapp kb:


The volume "Over Provisioned Space" value provided in OnCommand System Manager (OCSM) is the "Over Provisioned Size" field provided by the volume show at the cluster shell.

This value is determined by the following formula:

(volume size) - (volume used) - (volume space available) - (snapshot used space) == storage that can't be provided by the aggregate if written to the volume

for the ovirt part:

Ovirt will see the volume size available within thin-volume without any knowledge of the aggregate space (available/or not) in behind.




on netapp side do volume auto-grow and you are safe as long as you have free space inside aggregate.




On 05.11.19 14:54, Vrgotic, Marko wrote:

Second attempt 😊


From: "Vrgotic, Marko" <M.Vrgotic@activevideo.com>
Date: Monday, 4 November 2019 at 14:01
To: "users@ovirt.org" <users@ovirt.org>
Subject: oVirt and Netapp question


Dear oVirt,


Few months ago our production environment oVirt with main Shared storage via NFS Netapp is live.


We have been deploying VMs with thin provisioned HDD 40GB based template, CentOS 7.

The Netapp NFS v4  storage volume is 7TB in size, also Thin Provisioned.


First attached screenshot shows the space allocation of the production volume from Netapp side.

Is there anyone in oVirt community who would be able to tell me the meaning of the 5.31 TB Over Provisioned Space?



Second attached is the info  of the production volume from oVirt side:



What I want to understand is the way how is oVirt reading the volume usage and Netapp and where is the difference.

Is the Over Allocated Space something that is just logically used/reserved and will be intelligently re-allocated/re-used as the actual Data Space Used grows or am I looking at oVIrt actually hitting Critical Space Action Blocker and will have to resize the volume?

If there is anyone from Netapp or with good Netapp experience that is able to help understanding the data above better, thank you in advance?


Kindly awaiting your reply.




kind regards/met vrindelijke groet


Marko Vrgotic


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