Date: Fri, 1 Feb 2013 15:26:58 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: freebsd-hackers@freebsd.org Subject: HDD write cache Message-ID: <alpine.BSF.2.00.1302011524480.43260@wojtek.tensor.gdynia.pl>
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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)
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