It isn't clear why you are trying to change the master at this time. Can you explain? What is the status of the two hosts that have been patched and rebooted?

@Gheppy if you can have downtime snapshot/revert works

I just released 0.0.2 https://github.com/benapetr/XenAdminQt/releases/tag/v0.0.2-alpha The first version was really just a proof-of-concept demonstration, this second version is already pretty usable. It can handle all basic stuff, including provisioning of new VMs, VM control (start / stop / suspend / pause), force actions, parallel connections to multiple clusters etc. etc. Status of what is tested and works and what does: # Needs work * Menu items * Tree view - should show Virtual Disks, Networks in objects view * Pool HA tab missing * Actions and commands, see actions todo * Performance tab * Search tab has unfinished options panel * VM import / export * Folder and tag views * Network tab (host) - needs finish and test, especially wizards and properties * New pool wizard * New storage wizard * New VM wizard * VM deleting * HA tab * NIC tab - bonding * Clone VM * Create template from VM * Create VM from template # Needs polish * General tab - shows data, but access to data is weird (should use native XenObjects and their properties instead of scrapping QVarianMaps), overall layout is also not good * Memory tabs - they already work, but could look better * Console - it works most of the time, but there are random scaling issues during boot, RDP not supported * UI - menus and toolbar buttons sometime don't refresh on events (unpause -> still shows force shutdown) # Needs testing * VM disk resize * VM disk move * VM live migration * VM cross pool migration * Properties of Hosts, VMs and Pools * VM deleting * Options * Maintenance mode # Finished and tested * Add server * Connection to pool - redirect from slave to master * Connection persistence * Basic VM controls (start / reboot / shutdown) * Pause / Unpause * Suspend / Resume * Snapshots * VM disk management (create / delete / attach / detach) * SR attach / detach / repair stack * CD management * Grouping and search filtering (clicking hosts / VMs in tree view top level) * Tree view (infrastructure / objects) * Events history * Network tab (VM) * Host command -> Restart toolstack

But how one could check the integrity of a few blocks without context of the parent?