On Mer, 2005-04-27 at 19:40, mike.miller@xxxxxx wrote: > It looks like the OS/filesystem (ext2/3 and reiserfs) does not wait for for a successful completion. Is this assumption correct? Of course it doesn't. At 250 ops/second for a decent disk no OS waits for completions, all batch and asynchronously queue I/O. See man fsync and also O_DIRECT if you need specific "to disk" support. If you do that be aware that you must also turn write caching off on the IDE disk. I've repeatedly asked the "maintainer" of the IDE layer to do this automatically but gave up bothering long ago. Without that setting users are playing with fire quite honestly. The alternative with latest 2.6 stuff is to turn on Jens Axboe's barrier work which seems to give better performance on a drive new enough to have cache flush operations. Alan - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
