Date: Wed, 16 Apr 2003 08:49:54 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Jarkko Santala <jake@iki.fi> Cc: freebsd-alpha@freebsd.org Subject: Re: problem with UDMA mode on XP1000 Message-ID: <16029.20850.720877.563791@grasshopper.cs.duke.edu> In-Reply-To: <20030416122206.S316@trillian.santala.org> References: <Pine.OSF.4.33.0304151146380.1028-100000@poptart.bithose.com> <20030416122206.S316@trillian.santala.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Jarkko Santala writes: > On Tue, 15 Apr 2003, Jameel Akari wrote: > > > I had the same sort of problem in an Alpha PC164, but in the end > > the onboard IDE was so terrible and Tru64 refused to run a hard disk on > > it, so I bought an ISP1040 and went SCSI, and it's been solid. > > Well, I don't think it's that terrible: > > dd if=/dev/zero of=foo bs=1m count=100: > ad0: 104857600 bytes transferred in 6.863760 secs (15276991 bytes/sec) > da0: 104857600 bytes transferred in 8.200968 secs (12786003 bytes/sec) > > atapci0: <CMD 646 ATA controller> port 0x10180-0x1018f irq 5 at device 11.0 on pci0 > ad0: 117246MB <Maxtor 4G120J6> [238216/16/63] at ata0-master WDMA2 FWIW, WDMA2 is not safe as there is no CRC checking. I've seen corrupted (random, infrequent single bit errors) files when running a PC164LX with an ata drive in WDMA2 mode. The higher modes (UDMA33 ..) get you CRC checking. As soon as we noticed the corruption, we moved the box to SCSI. Drew
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?16029.20850.720877.563791>