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Is it safe to set file sync level 0 in aeron cluster in production?

I know it's unsafe to set file sync level 0 in a single node aeron cluster, because, in case of a crash, some data can be lost.

But what if we have at least 5 nodes in the cluster? I guess it is quite rare for 3 nodes to crash simultaneously! (if just 1 or 2 nodes crashes, all other nodes can still operate normally.)

Currently, what is the actual file sync level on the financial aeron clusters in production?