Can dledger ganrantee that once a log entry is committed, it will never disappear due to power outage of the all cluster?

[ahan-ai]

It seems like dledger may commit a log entry when the log entry is still in the page cache? （If I am wrong, let me know please.）

In the worst case, a log entry is commited, but still in page cache, and the whole cluster just get a power outage, the Log Entry is lost?

[supervate]

Now there seems only the async flush mechanism, indeed has the problem...

Now async flush is 10ms interval.