Hello Benoit,
Here are some results - 4.15.2 + XCP-NG. I made 2 VMs from template -
Centos 7, 46 GB hdd, 4% full
- VM1 - root disk is as full as template.
- VM2 - root disk is made full up to ~90% ( cat /dev/zero > test_file1
)then the file was removed so the used space is again 4%.
- scheduled backup goes through both VMs. First snapshot size is
- VM1 - 2.3G
- VM2 - 41G
- Then on VM2 this script was run to fill and empty the disk again -
cat /dev/zero > /opt/test_file1; sync; rm /opt/ test_file1.
- scheduled backup goes through both VMs. All snapshots size is:
- VM1 - 2.3G
- VM2 - 88G
Once the disk is filled you will get a snapshot with size no less than
the size of the whole disk.
May be there is a way to shrink it but I could not find it.
Best regards,
Jordan
-----Original Message-----
From: Yordan Kostov <[email protected]>
Sent: Tuesday, October 12, 2021 3:58 PM
To: [email protected]
Subject: RE: Size of the snapshots volume
[X] This message came from outside your organization
Hello Benoit,
Unfortunately no.
When I do it I will make sure to drop a line here.
Best regards,
Jordan
-----Original Message-----
From: benoit lair <[email protected]>
Sent: Tuesday, October 12, 2021 3:40 PM
To: [email protected]
Subject: Re: Size of the snapshots volume
[X] This message came from outside your organization
Hello Jordan,
Could you proceed to your tests ? Have you got the same results ?
Regards, Benoit Lair
Le lun. 4 oct. 2021 à 17:59, Yordan Kostov <[email protected]> a écrit :
> Here are a few considerations:
>
> - First snapshot of volume is always full snap.
> - XenServer/XCP-NG backups are always thin.
> - Thin provisioning calculations never go down. Even if you delete
> data from disk.
>
> As you filled the disk of the VM to top the thin provisioning threats
> it as full VM from that moment on even if data is deleted. So the full
> snap that will be migrated to NFS will always be of max size.
>
> I am not 100% certain as I am yet to start running backup tests.
>
> Best regards,
> Jordan
>
> -----Original Message-----
> From: Florian Noel <[email protected]>
> Sent: Monday, October 4, 2021 6:22 PM
> To: '[email protected]' <[email protected]>
> Subject: Size of the snapshots volume
>
>
> [X] This message came from outside your organization
>
>
> Hi,
>
> I've a question about the snapshots volume in Cloudstack
>
> When we take a snapshot of a volume, this create a VHD file on the
> secondary storage.
> Snapshot size doesn't match volume size used.
>
> Imagine a volume of 20GB, we fill the volume and empty it just after.
> We take a snapshot of the volume from Cloudstack frontend and its size
> is 20GB on the secondary storage while the volume is empty.
>
> We've made the same test with volume provisioning in thin, sparse and fat.
> The results are the same.
>
> We use Cloudstack 4.15.1 with XCP-NG 8.1. The LUNs are connected in
> iSCSI on the hypervisors XCP.
>
> Thanks for your help.
>
> Best regards.
>
>
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