Date: Sat, 25 Aug 2007 11:52:30 +0330 From: "Bahman M." <b.movaqar@gmail.com> To: "Tamouh H." <hakmi@rogers.com> Cc: freebsd-questions@freebsd.org Subject: Re: READ_DMA Error Message-ID: <6d62f69a0708250122l1bf53d84p73d64f17837a535@mail.gmail.com> In-Reply-To: <0f6001c7e3fa$4261e6f0$6900a8c0@tamouh> References: <6d62f69a0708210419t441042caxe36fcd81339b13e8@mail.gmail.com> <0f6001c7e3fa$4261e6f0$6900a8c0@tamouh>
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> > During FreeBSD 6.2 installation, the process failed because > > of errors like the one below: > > READ_DMA UDMA .... ICRC error LBA=37505132 > > > > I managed to install by setting hw.ata.ata_dma=0 at boot time > > but the same errors occur after installation and at boot time > > so I had to put hw.ata.ata_dma=0 in loader.conf and now the > > system is working. > > > > I checked my hard disk which a 80GB Western Digital+ > > thoroughly and there were no errors reported (using fsck in > > single user mode). Also I used to install Fedora Linux on > > this disk without any problems. > > > > It looks that disabling DMA caused my disk to work with lower > > performance. Am I right? If yes, are there any solutions to > > eliminate those READ_DMA errors while DMA is enabled? > > > > PS: > > Motherboard: ASUS A7V8X-X > > CPU: Athlon XP 2500 at 1833MHz > > $ uname -ai > > FreeBSD attila 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 10:40:27 > > UTC 2007 root@dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC > > i386 GENERIC > > Typically, I've seen the READ_DMA error when a hard drive is going bad or > something wrong with the hardware (power supply is failing). But it could be > as you've described. I tested with another hard disk, the one on which I'd installed FreeBSD in the past. I put it on another IDE channel but the same things happened. Now I wonder if it's my IDE controller which has problems. Some information about the hardware: # dmesg | grep -E "^ac?d[[:digit:]]" ad0: 76319MB <WDC WD800BB-00CJA1 17.07W17> at ata0-master PIO4 ad1: 19540MB <Maxtor 32049H2 YAC614Y0> at ata0-slave PIO4 acd0: DVDR <DVD RW DRU-820A/1.0b> at ata1-master UDMA66 acd1: DVDROM <DVD-ROM DDU1632/VER BS23> at ata1-slave UDMA33 # sysctl -a | grep ata_dma hw.ata.ata_dma: 0 # sysctl -a | grep atapi hw.ata.atapi_dma: 1 Bahman
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