I have published in my blog

small guide covering 2 topics:

1) Powering oVirt cluster hardware with budget-level UPS with LiFePO4 batteries. Most today’s budget priced UPS with power up to 10kWt still use lead-acid batteries with very low energy capacity per weight ratio and short lifespan.

2) Automatic shutdown script for all VMs and nodes in case of power line failure. It is not dependent of UPS model and its software agent. In fact, it doesn’t require UPS to have any built-in and agent software at all.

Feedback welcome.

with best regards

Andrei Verovski