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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