Date: Sun, 7 Dec 2003 15:45:57 -0800 (PST) From: Dan Strick <strick@covad.net> To: current@freebsd.org Cc: dan@mist.nodomain Subject: Re: SATA disks on 5.2-CURRENT Message-ID: <200312072345.hB7Njv1D000410@mist.nodomain>
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On Mon, 08 Dec 2003 07:53:48 +0900, Jun Kuriyama wrote: > > Hmm, is there any performance loss by using legacy mode? > If you have two disk drives on a single SATA150 controller, they can be accessed simultaneously in "native" mode because they are on different ATA channels. If the controller is operated in "legacy" mode, the two disk drives appear to be on the same ATA channel and only one can be used at a time though it may be possible to do "overlapped" operations. I have not attempted to measure a performance difference between these two configurations. The loss of an ATA channel is sufficient reason to avoid legacy mode. Dan Strick strick@covad.net
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