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On Tue, Dec 02, 2003 at 11:31:45AM -0500, Greg Stark wrote: > > Mike Fedyk <mfedyk@matchmail.com> writes: > > > > Libata, uses the scsi system instead of the existing ide layer because many > > > new sata controllers are using an interface that is very similair to scsi > > > (much like atapi). > > Now I have a different question. Does the scsi-like SATA interface include tcq? Yes, it does. But it depends on whether or not the host controller supports TCQ. > Because one of the long-standing issues with IDE drives and Postgres is the > fact that even after issuing an fsync the data may be sitting in the drive's > buffer. If true, this is an IDE driver bug... assuming the drive itself doesn't lie about FLUSH CACHE results (a few do). > This doesn't happen with SCSI because the drives aren't forced to lie > about the data being on disk in order to handle subsequent requests. Turning > off write-caching on IDE drives absolutely destroys performance. If the drive lies, there isn't a darned thing we can do about it... > Do the new SATA drives and controllers provide a solution to this? If the drive lies, there isn't a darned thing the controller can do about it, either ;-) Jeff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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