Date: Sun, 27 Jul 2008 06:24:29 +0200 From: Erik Trulsson <ertr1013@student.uu.se> To: Jason Lenthe <lenthe@comcast.net> Cc: freebsd-questions@freebsd.org Subject: Re: SATA300 Message-ID: <20080727042429.GA99908@owl.midgard.homeip.net> In-Reply-To: <488BE9F2.1070409@comcast.net> References: <488BE9F2.1070409@comcast.net>
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On Sat, Jul 26, 2008 at 11:22:26PM -0400, Jason Lenthe wrote: > My machine, a home-brew running 7.0-RELEASE-p2, has 3 SATA hard drives > all of which were advertised as SATA300 drives, but: > > vader# dmesg | grep ATA > ata0: <ATA channel 0> on atapci0 > ata1: <ATA channel 1> on atapci0 > atapci1: <Intel ICH7 SATA300 controller> port > 0x20c8-0x20cf,0x20ec-0x20ef,0x20c0-0x20c7,0x20e8-0x20eb,0x20a0-0x20af > irq 19 at device 31.2 on pci0 > ata2: <ATA channel 0> on atapci1 > ata3: <ATA channel 1> on atapci1 > ad4: 305245MB <Hitachi HDT725032VLA360 V54OA7EA> at ata2-master SATA150 > ad5: 476940MB <MAXTOR STM3500630AS 3.AAE> at ata2-slave SATA150 > ad6: 305245MB <Hitachi HDT725032VLA360 V54OA7EA> at ata3-master SATA150 > > Does this mean I'm only getting half the throughput I could be getting? Considering that the fastest SATA drives available today tops out at a throughput of about 120MB/s (and most are quite a bit slower), I would say that any speed loss from running at SATA150 speed instead of SATA300 will be fairly minor and probably not even noticable. Many SATA hard drives have a jumper that can be used to limit them to SATA150 speeds. It is often set by default, since some older SATA controllers fail to auto-negotiate speed correctly, so the drive must be running at SATA150 to work with those controllers. See if you drives have such a jumper set. If so try removing it. -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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