Hello oVirt Padawan,

You can install new engine machine and import existing storage domains there. https://www.ovirt.org/develop/release-management/features/storage/importstoragedomain/ Please read restrictions and limitations.

I think it's more safe way to go in such kind of situations.

On Wed, Jan 4, 2017 at 6:40 PM, Rogério Ceni Coelho <rogeriocenicoelho@gmail.com> wrote:

Hi oVirt ObiWan´s,

Today i try to rollback 4.0.5 to 4.0.4 because some instability with the following method and i crash on a problem. :-(

I shutdown oVirt Engine and make checkpoint on Engine VM ( Runs on Hyper-V, don´t ask me way ... ). Rollback vm checkpoint to point in time before 4.0.5 update process and power up ovirt engine vm. Everything ok but, six virtual machines that i create before this point in time does not exist on oVirt Engine Database and all came with external-VMNAME and i can not do nothing on them. I really think (only in my dreams ) that when ovirt engine goes up and talk with ovirt nodes, all new vm will be automatically discovered again. The worst thing are that i use SAN Storage Domain and oVirt use LVM to storage VM disks, so i don´t know how to find vm disks that ovirt engine does not recognize (external-VMNAME).

After all that, i rollback again to 4.0.5 and every vm are ok now again, but i want to test this rollback process to 4.0.4 and do this on Production.

I think the right steps are :

1. Run engine-backup  /bin/engine-backup --mode=backup --scope=all --file=/root/ovirt/`hostname`.`date +%d%m%Y.%H%M%S`.ovirt-engine.bkp --log=/tmp/ovirt-engine_backup.log

2. Shutdown ovirt engine vm.

3. Make new checkpoint to rollback with something goes wrong

4. Rollback to checkpoint witch 4.0.4

5. Restore engine-backup (from version 4.0.5)

6. Start everything and check if all are ok

This is the right way to rollback from one sub release to another ( 4.0.5 to 4.0.4 ) ???

This checkpoints/snapshots of ovirt-engine VM are the best way to rollback in time ???

Thanks in advance.

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Pavel Zhukov

Software Engineer

RHEV Devops

IRC: landgraf