Hello Yordan, I had same results with xcp-ng 8.2 and ACS 4.15.1
The max filled during the life of the disk will be the size of the snapshot That's why i looking towards SDS with a solution giving me possibility to do some thin provisionning with XCP-NG I was thinking about an SDS which could give me block storage or at least file storage and acting as a proxy between my iscsi array and my xcp-ng Linstor could be a solution, but for the moment i don't know if the plugin will be compatible with xcp-ng Regards, Benoit Le mar. 19 oct. 2021 à 11:46, Yordan Kostov <yord...@nsogroup.com> a écrit : > 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 <yord...@nsogroup.com> > Sent: Tuesday, October 12, 2021 3:58 PM > To: users@cloudstack.apache.org > 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 <kurushi4...@gmail.com> > Sent: Tuesday, October 12, 2021 3:40 PM > To: users@cloudstack.apache.org > 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 <yord...@nsogroup.com> 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 <f.n...@webetsolutions.com> > > Sent: Monday, October 4, 2021 6:22 PM > > To: 'users@cloudstack.apache.org' <users@cloudstack.apache.org> > > 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. 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