> -----Original Message----- > From: Alan Cox [mailto:alan@xxxxxxxxxxxxxxxxxxx] > Sent: Thursday, April 28, 2005 9:58 AM > To: Miller, Mike (OS Dev) > Cc: Linux Kernel Mailing List; linux-scsi@xxxxxxxxxxxxxxx; > brace@xxxxxx > Subject: Re: [Question] Does the kernel ignore errors writng to disk? > > 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 Thanks, Alan. I'll try Jens barrier. > > - : 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
