search for: background_dirty_threshold

Suppose I have a large machine with 24Gig of memory, and I write a 2 gig file. This is below 10% and so background_dirty_threshold wont cause any write out. Suppose that a regular journal commit is then triggered. Am I correct in thinking this will flush out the full 2Gig, causing the commit to take about 30 seconds if the drive sustains 60Meg/second? If so, what other operations will be blocked while the commit happens? I...