Date: Mon, 22 Nov 2004 23:03:25 -0500 From: David Gilbert <dgilbert@dclg.ca> To: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> Cc: David Gilbert <dgilbert@dclg.ca> Subject: Re: List of fake vs. real SATA drives. Message-ID: <16802.46733.409188.353864@canoe.dclg.ca> In-Reply-To: <41A251F5.9020601@DeepCore.dk> References: <16798.12075.465147.307112@canoe.dclg.ca> <864qjixdpi.wl%sf@FreeBSD.org> <41A1FB7D.9000308@jonny.eng.br> <Pine.OSX.4.61.0411221417120.787@oof.local> <41A2444E.2090609@jonny.eng.br> <16802.17819.983480.763628@canoe.dclg.ca> <41A251F5.9020601@DeepCore.dk>
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>>>>> "Søren" == Søren Schmidt <sos@DeepCore.dk> writes: Søren> David Gilbert wrote: >>>>>>> "João" == João Carlos Mendes Luís <jonny@jonny.eng.br> writes: >> >> >> João> IIF they really have command queueing, I do believe. So, a >> João> bridged SATA drive will not have command queuing, right? >> >> Well... from what I've read, the WD bridged drives do have queueing >> because they had an ATA-100 implementation of it. >> >> João> Does FreeBSD already take advantage of this? How could I >> check João> if my SATA drivers have command queueing or not? >> >> I'd like to know as well. Søren> Currently the ATA driver does not support neither TCQ nor NCQ. Søren> For this to work at all both disk and controller needs to Søren> support the mode in question. I've just gotten my hands on one Søren> of the new Promise controllers that supports NCQ, but I still Søren> need disks to get it going. I do have a few Raptor's that Søren> support the TCQ mode but initial testing shows little benefit Søren> from it so it moved to the backburner... Do you need direct access to a drive or is access to a machine with a drive/controller in it sufficient. Are promise controllers the only ones to support NCQ so far? Promise doesn't always have the best reputation. We may be able to provide a test machine with remote access to a drive/controller combination. -- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================
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