I'm planning to deploy a scalable VDI infraestructure where each phisical host can run over 100 VDIs and I'd like to deploy 10 physical hosts (1000 VDIs).

In order to avoid performance problems (replicating 1000VDIs changes over gluster network I think can provoque performance problems) I have thought to use local storage for VDI assuming that VDIs cannot be migrated between phisical hosts.

¿Is my worry founded in terms of performance?

¿Is it possible to utilize local SSD storage for VDIs?

I'd like to configure a gluster volume for backup on rotational disks (tiered+replica 2+ stripe=2) just to provide HA if a physical host fails.

¿Is it possible to use rsync for backing up VDIs?

If not ¿How can I sync/backup  the VDIs running on local storage on the gluster shared storage?

If a physical host fails ¿How can I start the latest backup of the VDI on the shared gluster?

Thanks a lot