Date: Mon, 22 Nov 2004 23:44:16 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Stephen Montgomery-Smith <stephen@math.missouri.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: List of fake vs. real SATA drives. Message-ID: <41A26BC0.3030803@DeepCore.dk> In-Reply-To: <41A25860.8030901@math.missouri.edu> References: <20041122215408.gjzs36hxmsoo00@.mailhost.wsf.at> <41A25860.8030901@math.missouri.edu>
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Stephen Montgomery-Smith wrote: > Thomas Wolf wrote: >=20 >> Stephen Montgomery-Smith <stephen@math.missouri.edu> schrieb: >> >>> FUJISHIMA Satsuki wrote: >>> >>>> Currently native SATA drives are still not so popular. There are: >>> >>>> Seagate Barracuda ATA V, 7200.7, 7200.8 >>> >>> I have one of these, and I am really impressed by its performance. I= =20 >>> added one to my computer, which came with a Maxtor 6Y080L0. My main = >>> disk intensive operation is creating the CTM deltas (as in CTM which = >>> is an alternative to CVSUP for people behind unfriendly firewalls). = >>> The performance difference was somewhat collosal, as in something=20 >>> like 3 times faster. To be honest, I am still at a loss to explain=20 >>> why the Seagate did so very much better - maybe it is the 8M cache as= =20 >>> compared to the 2M cache. The Seagate 7200.7 had similar performance= =20 >>> to a Seagate 160MHz SCSI drive that I have on another computer. >> >> Ah, please tell me more about it, is this a ST3120827AS? >> (I would need the exact PartNo.) What controller dou you have and=20 >> finally, on which version of FreeBSD? >> > ST380013AS with Intel ICH5 SATA150 controller and FreeBSD 4.10-Stable. = > The kernel reports that it is running at UDMA33, but the actual=20 > performance seems much better than that. Hold on right there, the ST380013AS is a Barracuda V 7200.7 device and=20 does not do any form of tagging, neither does the ICH5 support it. You=20 are just enjoying the stock speed of modern (S)ATA gear :) Oh, and 4.x has no notion of SATA it only works on controllers that can=20 emulate the old ATA way of things. This is means that the ATA33 speed=20 isn't whats used as SATA v1 always runs at 150MB/s, just 4.x has no way=20 of telling. --=20 -S=F8ren
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