Hello,

I saw from some mails in the list that the approach for upgrading from 4.3 to 4.4 will be similar to the 3.6 => 4.0 one.

Reading the RHV 4.0 Self Hosted Engine Guide it seems it was necessary to have a second host, going through this:

5.4. Upgrading a RHEV-H-Based Self-Hosted Engine Environment

https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.0/html/self-hosted_engine_guide/upgrading_a_rhev-h-based_self-hosted_engine_environment

and also

https://www.ovirt.org/develop/release-management/features/sla/hosted-engine-migration-to-4-0.html

upgrade process involved:

- set global ha maintenance

- install a new host (and set it as on hosted engine one)

- migrate engine VM to this host and set the host as the SPM

- create a backup with engine-backup, verify its contents and copy to the host in some directory

- run the upgrade utility on the host to update the engine VM

hosted-engine --upgrade-appliance

this will create a backup floating disk of the engine vm disk for rollback purposes and override the existing engine disk with a new one where to deploy the new engine version applying also the restore from the engine-backup

--> what are requirements for 4.4 engine VM and so free storage to have on engine storage domain?

The engine-setup will be automatically executed on the new version engine VM

- exit from global maintenance

- update remaining hosts

Is the above procedure the correct one that I can test on a 4.3.9 lab?

The 3.6 -> 4.0 flow implied that a 4.0 host could run a 3.6 engine VM

Because the backup disk operation is done by the current running engine itself.

So it should be true also for 4.3 -> 4.4 and a 4.4. host should be able to run a 4.3 engine, correct?

In case of single 4.3.9 ovirt-node-ng host HCI with Gluster, can I apply the upgrade in a similar way?

Something like:

- create engine-backup and copy over to the host

- put host into global maintenace

- shutdown all VMS, engine included

- enable 4.4. repo

- install new image-base 4.4

is this correct and I can use 4.3 and 4.4 image base versions or do I have to sort-of-scratch necessarily? because 4.3 host is based on el7 while 4.4 on el8... but perhaps on mage based system I have flexibility..?

what version of gluster will it be applied? Incompatibilities with the current 4.3.9 one (version 6.8-1.el7)

- reboot host

- exit global maintenance and wait for engine vm to come up correctly

- enter global maintenance again

- run the upgrade utility on the host

Or do I need at least temporarily a new server to use as the 4.4. host, or what will be the expected path?

Thanks,

Gianluca

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