[DRBD-user] DRBD fsync() seems to return before writing to disk

[Felix Frank]

On 06/21/2012 01:10 PM, Phillip Frost wrote:
> Not a problem if you have money to spend on battery-backed cache, and can tolerate the added risk of power loss when the battery has failed, or is reconditioning, or is being replaced, or power loss longer than battery hold time, but for everyone else, it's a big problem.

I'd argue that it's problematic even then. If your assumptions are
correct, I don't see anything here that asserts that the sync call has
even reached the RAID Controller cache.

It all seems quite suspicious though - a bug like that should have been
noticed earlier, or so I'd believe.