>>> On 2/26/2010 at 06:11 PM, "Austin, Alyce (CIV)" <[email protected]> wrote: > Does anyone know when Linux decides to write cache out to DASD? > > When the cache is full or when the data set is closed?
Neither. It's asynchronous, but generally I/Os to disk get committed within a couple of seconds, although that can vary. A "sync" command will cause all pending writes to happen, but if the system is active at all, then new I/Os happen right away that get cached. Mark Post
