I would start over.
Get your backup and restore the engine crom backup.If backup is unavailable, deploy a fresh engine and import the storafe domains, Templates and then the VMs.

Once you have a working engine, update to latest 4.3 /I think it was 4.3.10 / Keep in mind that older versions do not work.

Once you have a 4.3.10, backup and then rebuild a host with EL8. Then you can reatore your enginw on that node with the 4.3.10 backup

Next step is to import the rest of the nodes (do not let the same host to be managed by more than 1 engine)

Best Regards,
Strahil Nikolov

On Fri, May 13, 2022 at 17:38, Vatslav Lan
<lesorubya@gmail.com> wrote:
I have installed RHEV 4.3.4.
I wanted to migrate the host to Ovirt 4.5. As a result I loss of the oVirt Engine’s database (configuration).

RHEV host is up, RHE engine is up to. But Storage Domain is deactive.
All data of Storage Domains is ok.
I tried to import Storage Domain to Ovirt 4.5 (according to documentation 3.6 - https://www.ovirt.org/develop/release-management/features/storage/importunregisteredentities.html)
But get error "Error while executing action Attach Storage Domain: AcquireHostIdFailure"

Please help recovery oVirt.
Minimun: - copy data from Storage Domain
Maximu: recovey VM entities
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