On Wed, Jul 18, 2007 at 06:23:25AM -0400, Justin Piszcz wrote: > I recently got a chance to test SW RAID5 using 750GB disks (10) in a RAID5 > on a 3ware card, model no: 9550SXU-12 > > The bottom line is the controller is doing some weird caching with writes > on SW RAID5 which makes it not worth using. Did you use the settings documented in http://www.3ware.com/KB/article.aspx?id=11050 ? Setting nr_requests and the deadline scheduler doubled the seq write performance for me. Do you have the latest firmware? Firmware updates can improve performance - at least for RAID5/6; I somewhat doubt that they care about JBOD performance that much... Gabor -- --------------------------------------------------------- MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences --------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
