Date: Wed, 14 Jan 2004 06:24:37 -0600 (CST) From: James Van Artsdalen <james@jrv.org> To: freebsd-amd64@freebsd.org Subject: ATA (Re: AMD64 support in 5.x versions) Message-ID: <200401141224.i0ECObwr093993@bigtex.jrv.org> References: <Pine.GSO.4.44.0401071115150.8910-100000@odin.cs.kun.nl> <17426.6989030459$1073697945@news.gmane.org> <btuv0n$2hb$1@sea.gmane.org> <20040113070204.GA764@curacao.n2it.nl>
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> Date: Tue, 13 Jan 2004 08:02:04 +0100 > From: Bill Squire <billsf@curacao.n2it.nl> > I've got several large SCSI disks spinning and have since purchased an > ordinary ATA-133 IDE and a SATA drive. SCSI vs. ATA can be a religious argument. On the practical side if you have more than 4 GB of RAM I don't know of any cost-effective solution that can address memory above 4 GB directly, without using bounce-buffers. I understand that some Adaptec SCSI host adapters can do this (PCI "dual address cycle" or a full 64-bit bus if available) without resorting to exotic RAID controllers. Highpoint sells an RR-1820 PCI-X (64-bit 133 MHz) serial ATA controller but I cannot get them to send me any technical documentation and cannot get it to work with Windows with the supplied drivers. Silicon Image has a 3124 chip which is PCI-X and ought to be able to directly address more than 4 GB of RAM but I don't know of any card that uses this yet. I have 8 GB of RAM and use a HighPoint 1542 sATA controller, and am no doubt exercising the bounce buffers extensively. This seems entirely stable but for performance I wouldn't want to do it with a disk-bound system in a production environment.
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