how Sangfor HCI behaves in the event of an unexpected power outage?
  

Newbie876436 Lv1Posted 2026-Jul-09 21:41

This may be a simple question, but I would like some clarification about how Sangfor HCI behaves in the event of an unexpected power outage.

In a traditional infrastructure consisting of hosts and a SAN with a disk array, the RAID controller typically includes a battery-backed cache. This allows pending writes to be safely committed and enables write-back caching even if the system loses power unexpectedly.

Of course, I understand that it is possible to deploy UPS systems that communicate with the HCI platform so that, in the event of a power failure, they can gracefully shut down the virtual machines and then the physical hosts.

However, my question is about a worst-case scenario: what happens if power is suddenly lost to all hosts, or at least to multiple parent hosts at the same time, before a graceful shutdown can take place? What happens to the data in that situation?

Throughout my career working with traditional (non-hyperconverged) infrastructures, I've experienced several unexpected power outages, and fortunately I've never encountered data corruption or startup issues after power was restored (perhaps I've just been lucky).

Unfortunately, even in well-designed environments, power failures remain a relatively common risk in small and medium-sized enterprise data centers.

I would really appreciate hearing your thoughts on this topic, as well as any real-world experiences you may have had. Most importantly, I would like to understand how Sangfor HCI is designed to protect data and prevent data loss or corruption during an unexpected power outage.

I hope this isn't too basic a question, but it's something I've been wondering about, and I would appreciate some clarification.