Date: Fri, 7 Aug 2009 00:47:07 +0200 From: Juergen Lock <nox@jelal.kn-bremen.de> To: "Rick C. Petty" <rick-freebsd2008@kiwi-computer.com> Cc: Alexander Motin <mav@FreeBSD.org>, freebsd-current@FreeBSD.org, Juergen Lock <nox@jelal.kn-bremen.de> Subject: Re: (es)ata drives may need an explicit spinup command? Message-ID: <20090806224707.GA7454@triton.kn-bremen.de> In-Reply-To: <20090806213048.GA17945@keira.kiwi-computer.com> References: <20090806191848.GA14171@triton.kn-bremen.de> <4A7B357C.5010203@FreeBSD.org> <20090806213048.GA17945@keira.kiwi-computer.com>
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On Thu, Aug 06, 2009 at 04:30:49PM -0500, Rick C. Petty wrote: > On Thu, Aug 06, 2009 at 10:56:44PM +0300, Alexander Motin wrote: > > Juergen Lock wrote: > > >So I tested esata on a siis pcie card with a 750G Seagate Freeagent Pro > > >drive and it does work - until the drive falls into powersave mode > > >after being idle for a little while. :( (I had the drive on 1394 > > >before on another box where it was able to recover from this condition, > > >but not on usb or esata - and the drive's 1394 interface died a while > > >ago and also esata is faster anyway...) > > > > > > And now I came across this patch for the linux ata driver: > > > http://git.kernel.org/?p=linux/kernel/git/jgarzik/libata-dev.git;a=commitdiff;h=169439c2e35f01e7832a9b4fc8a7446980c3d593;hp=1e999736cafdffc374f22eed37b291129ef82e4e > > > > > > So my question is, could the same be done in our ata code? > > >I have a slight :) hope it would help this drive too at least as it > > >does seem to work on Linux... > > > > I am not sure it is related to your case, as you said your drive works > > for some time after plug. If drive spun-down automatically due to > > inactivity, it should spin-up automatically also, as OS unable to track > > that transition. 30 seconds of ATA command timeout should be sufficient > > for drive to do this. Do you have any other symptoms? > > I believe this patch is for something different. Certain drives are > automatically spun down at power up. One such drive is in my satellite > provider's DVR. If you hook it up to regular SATA and power, it will never > spin up. It requires a special ATA command to tell it to spin up. I > believe the linux patch does precisely this. I know there's a special > SATA power cable that tells the drive not to spin up until given the spinup > command, which I also found in my satellite provider's DVR. Basically this > is done through pin 11: > http://en.wikipedia.org/wiki/Serial_ATA#Power_supply > > Although not every drive supports this feature. Yup it does seem to be something different after all as the new siis(4) driver handles the condition just fine, apparently I only tested the drive on the old ata driver. Oh well... Juergen
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