[ovirt-users] Re: Guest VM snapshots are not retained when importing data storage domain

Theoretically, all the data for the snapshot is both in the Engine's DB and on storage (OVF file). I was afraid to migrate from 4.3 to 4.4 , as I was planning to wipe the engine and just import the VMs..., but I was not sure about the snapshots.

Most probably this is a bug. @Sandro, can you assist with this one ? Best Regards, Strahil Nikolov На 31 юли 2020 г. 10:01:17 GMT+03:00, Alex K <rightkicktech(a)gmail.com&gt; написа: >Has anyone been able to import a storage domain and still have access >to VM >snapshots or this might be a missing feature/bug that needs to be >reported? >Reading the redhat docs about the storage domain import it seems there >is >no mention of VM snapshots if they should be accessible following the >import. >Thanx > >On Thu, Jul 30, 2020 at 3:58 PM Alex K <rightkicktech(a)gmail.com&gt; wrote: > >> Hi all, >> >> I have a dual node self hosted cluster v4.3 using gluster as storage >so as >> to test an actual scenario which will need to be followed at >production. >> The purpose is to rename the cluster FQDN to a new one, wiping out >any >> reference to the old previous FQDN. I was not successful in using the >> engine-rename tool or other means as there are leftovers from >previous FQDN >> that cause issues. >> >> The cluster has a data storage domain with one guest VM running on it >> which has one snapshot. >> I am testing a destructive scenario as below and I find out that when >> importing the storage domain to the newly configured cluster, while >the >> guest VM is imported fine, I do not see the guest VM disk snapshots. >> >> Steps that I follow for this scenario: >> >> *Initial status: * >> I have an ovirt cluster with two hosts named v0 and v1. >> The gluster storage domain is configured at a separate network where >the >> hosts are named gluster0 and gluster1. >> The cluster has an engine and data storage domain named "engine" and >"vms" >> respectively. >> The "vms" storage domain hosts one guest VM with one guest VM disk >> snapshot. >> All are configured with fqdn *localdomain.local* >> >> *# Steps to rename all cluster to new fqdn lab.local and import "vms" >> storage domain* >> 1. Set v1 ovirt host at maintenance then remove it from GUI. >> 2. At v1 install fresh CentOS7 using the new FQDN lab.local >> 3. at v0 set global maintenance and shutdown engine. Remove the >engine >> storage data. (complete wipe of any engine related data. What is >important >> is only VM guests and their snapshots). >> 4. at v0, remove bricks belonging to "engine" and "vms" gluster >volumes >> of v1 and detach gluster peer v1. >> >> gluster volume remove-brick engine replica 1 >> gluster1:/gluster/engine/brick force >> gluster volume remove-brick vms replica 1 gluster1:/gluster/vms/brick >force >> gluster peer detach gluster1 >> >> 5. On v1, prepare gluster service, reattach peer and add bricks from >v0. >> At this phase all data from vms gluster volume will be synced to the >new >> host. Verify with `gluster heal info vms`. >> from v0 server run: >> >> gluster peer probe gluster1 >> gluster volume add-brick engine replica 2 >gluster1:/gluster/engine/brick >> gluster volume add-brick vms replica 2 gluster1:/gluster/vms/brick >> >> At this state all gluster volume are up and in sync. We confirm "vms" >sync >> with >> gluster volume heal info vms >> >> 6. At freshly installed v1 install engine using the same clean >gluster >> engine volume: >> hosted-engine --deploy --config-append=/root/storage.conf >> --config-append=answers.conf (use new FQDN!) >> >> 7. Upon completion of engine deployment and after having ensured the >vms >> gluster volume is synced (step 5) remove bricks of v0 host (v0 now >should >> not be visible at ovirt GUI) and detach gluster peer v0. >> at v1 host run: >> gluster volume remove-brick engine replica 1 >> gluster0:/gluster/engine/brick force >> gluster volume remove-brick vms replica 1 gluster0:/gluster/vms/brick >force >> gluster peer detach gluster0 >> >> 8. Install fresh CentOS7 on v0 and prepare it with ovirt node >packages, >> networking and gluster. >> 9. At v0, attach gluster bricks from v1. Confirm sync with gluster >volume >> heal info. >> at v1 host: >> gluster peer probe gluster0 >> gluster volume add-brick engine replica 2 >gluster0:/gluster/engine/brick >> gluster volume add-brick vms replica 2 gluster0:/gluster/vms/brick >> >> 10. at engine, add entry for v0 host at /etc/hosts. At ovirt GUI, add >v0. >> /etc/hosts: >> 10.10.10.220 node0 v0.lab.local >> 10.10.10.221 node1 v1.lab.local >> 10.10.10.222 engine.lab.local engine >> >> 10.100.100.1 gluster0 >> 10.100.100.2 gluster1 >> >> 11. At ovirt GUI import vms gluster volume as vms storage domain. >> At this step I have to approve operation: >> [image: image.png] >> >> >> 12. At ovirt GUI, import VMs from vms storage domain. >> At this step the VM is found and imported from the imported storage >domain >> "vms", but the VM does not show the previously available disk >snapshot. >> >> The import of the storage domain should have retained the guest VM >> snapshot. >> How can this be troubleshooted? Do I have to keep some type of engine >DB >> backup so as to make the snapshots visible? If yes, is it possible to >> restore this backup to a fresh engine that has a new FQDN? >> Thanx very much for any advise and hint. >> >> Alex >> >>