On Sat, Mar 12, 2005 at 07:21:57PM -0500, Scot L. Harris wrote: > On Sat, 2005-03-12 at 17:25, Tim Fenn wrote: > > > take a look at /etc/sysconfig/harddisks, but more importantly > > /etc/rc.sysinit, around lines 850-900. > > > > I've found if I'm not using a (good) udma cable or one of the devices > > on the cable doesn't support dma, dma is disabled on everything on > > that cable. If I start forcing settings, Bad Things can happen. > > I see in /etc/sysconfig/harddisks where dma is commented out. Should I > create a harddiskshda file and set that on? > > The drives in the system are SATA drives. Not sure that DMA applies to > those. > Oh. Then nevermind. ;) hdparm doesn't support all the SATA settings yet, IIRC, but SATA should be setup automagically with reasonable settings, anyway. I've actually heard several people now complain about plextor drives under linux, maybe its something more general? what do you get if you grep ata from /var/log/dmesg? I have a single sata hard drive, and I typically get: ata1: SATA max UDMA/100 cmd 0xE081C080 ctl 0xE081C08A bmdma 0xE081C000 irq 11 ata2: SATA max UDMA/100 cmd 0xE081C0C0 ctl 0xE081C0CA bmdma 0xE081C008 irq 11 ata1: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:207f ata1: dev 0 ATA, max UDMA/133, 234441648 sectors: lba48 ata1(0): applying Seagate errata fix ata1: dev 0 configured for UDMA/100 scsi0 : sata_sil ata2: no device found (phy stat 00000000) scsi1 : sata_sil Vendor: ATA Model: ST3120026AS Rev: 3.18 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB) SCSI device sda: drive cache: write back SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB) SCSI device sda: drive cache: write back sda: sda1 sda2 sda3 Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 which suggests all is good at UDMA/100 (the highest my host controller allows). HTH, Tim -- Morals? I eat communism and $h!t America, brother. --Seanbaby
