On Tue, May 21, 2019 at 3:21 PM Miha Verlic <ml@krneki.org> wrote:
Hello,
I have a few questions regarding migration of HostedEngine. Currently I have a cluster of 3 oVirt 4.3.3 nodes, all three of them are capable of running HE and I can freely migrate HostedEngine and regular VMs between them. However I deployed HostedEngine storage on rather edgy NFS server and I would like to migrate it to iSCSI based storage with multipathing. Quite a few VMs are already running on cluster and are using iSCSI data storage.
Documentation is rather chaotic and fragmented, but from what I gathered the path of migration is someting like:
- place one host (#1), the "failover" host, into maintenance mode prior to backup - export configuration with engine-backup - set global maintenance mode on all hosts
Hi, fine till here, then - copy the backup file on the host you are going to use for the restore - run something like hosted-engine --deploy --restore-from-file=/root/engine-backup.tar.gz - when the tool will ask about HE storage domain, provide the details to create a new empty one - once done, connect to the engine, set host 2 into maintenance mode and reinstall it from the engine choosing to redeploy hosted-engine - do the same for host 3 - at the end the previous hosted-engine storage domain will be still visible (but renamed) in the engine; eventually migrate out other VM disks created there; once ready you can delete it
- install ovirt engine on that host (#1) (already installed, since this is HE capable host) - restore engine configuration using engine-backup - run engine-setup with new parameters regarding storage - after engine-setup, log into admin portal and remove old host (#1) - redeploy hosts #2 and #3
Last two steps are a bit confusing as I'm not sure how removing old failover host on which new HE is running would work. Also not understanding the part where hosts 2 and 3 are described as unrecoverable (but with running VMs, which I'd have to live migrate to other hosts - how, if they're not operational?).
Few other things:
- Should I first remove & re-add host #1 without HE already deployed on host?
- Should I set global maintenance mode on all hosts before migration? I'm guessing this is required if I want to prevent HE being started on random host during transition...
- Which host should be selected as SPM during the transition phase?
- How can I configure iSCSI multipathing? Self-hosted engine documentation mentions Multipath Helper tool, however I cannot find any info about it. Is this tool freely available or only a part od RHEL subscription?
- Can I configure existing iSCSI Domain which already hosts some VMs as HE storage? Or do I have to assign extra LUN/target exclusively for HE?
Cheers -- Miha _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/R2HRFJE5UDRIA5...
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