Date: Sat, 2 Feb 2013 01:14:37 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-hackers@freebsd.org Subject: Re: HDD write cache Message-ID: <alpine.BSF.2.00.1302020113470.402@wojtek.tensor.gdynia.pl> In-Reply-To: <DF4C0697C59747BEBE5DF564E0B934EB@multiplay.co.uk> References: <alpine.BSF.2.00.1302011524480.43260@wojtek.tensor.gdynia.pl> <DF4C0697C59747BEBE5DF564E0B934EB@multiplay.co.uk>
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> registered. > > Try setting the values in /boot/loader.conf if you haven't already? > > You can check the actual status of the disk itself using:- > camcontrol identify ada0 this proved your statement. will check it out at next reboot. > > Regards > Steve > > ----- Original Message ----- From: "Wojciech Puchar" > <wojtek@wojtek.tensor.gdynia.pl> > To: <freebsd-hackers@freebsd.org> > Sent: Friday, February 01, 2013 2:26 PM > Subject: HDD write cache > > >> after reading quite recent topics about disabling/enabling write cache, i >> tried to test in on desktop 3.5" drive >> >> kern.cam.ada.write_cache: 1 >> kern.cam.ada.read_ahead: 1 >> kern.cam.ada.0.read_ahead: -1 >> kern.cam.ada.0.write_cache: -1 >> >> i tried writing 1 or 0 to kern.cam.ada.0.write_cache, and there were >> exactly no differences at all, and disk seems to do always write caching. >> >> Does that drive lie and ignore commands or i do it wrong? >> >> this is my disk. >> >> ada0 at ahcich0 bus 0 scbus0 target 0 lun 0 >> ada0: <SAMSUNG HD501LJ CR100-10> ATA-8 SATA 2.x device >> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) >> ada0: Command Queueing enabled >> ada0: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C) >> >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >> > > ================================================ > This e.mail is private and confidential between Multiplay (UK) Ltd. and the > person or entity to whom it is addressed. In the event of misdirection, the > recipient is prohibited from using, copying, printing or otherwise > disseminating it or any information contained in it. > In the event of misdirection, illegible or incomplete transmission please > telephone +44 845 868 1337 > or return the E.mail to postmaster@multiplay.co.uk. > >
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