Date: Mon, 29 Jun 2009 14:54:17 +0200 From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net> To: Alexander Motin <mav@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: RFC: ATA to CAM integration patch Message-ID: <20090629125417.GC72094@acme.spoerlein.net> In-Reply-To: <4A48A44C.3030303@FreeBSD.org> References: <4A4517BE.9040504@FreeBSD.org> <200906271419.49329.pieter@degoeje.nl> <4A464EED.3070700@FreeBSD.org> <4A465F8C.4030901@samsco.org> <20090629105556.GB72094@acme.spoerlein.net> <4A48A44C.3030303@FreeBSD.org>
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On Mon, 29.06.2009 at 14:23:56 +0300, Alexander Motin wrote: > Ulrich Spörlein wrote: > > On Sat, 27.06.2009 at 12:06:04 -0600, Scott Long wrote: > >> Alexander Motin wrote: > >>> This is not a problem. ATA disks does not have SCSI INQUIRY command. > >>> They use own IDENTIFY instead. inquiry should work for ATAPI devices, as > >>> they are SCSI deep inside. > >> This is really the big missing piece in camcontrol; we need to add > >> support for getting the IDENT info and getting/setting various > >> attributes, as well as sending ATA commands over passthrough. > > > > not sure if this is related, but I always wondered why tools like > > smartctl never work with USB attached ATA disks. Is it missing support > > in our drivers and smartctl or is it simply impossible? > > I don't know much about USB storages and protocols used there, but I > think it is the ATA->SCSI protocol conversion done by ATA->USB adapter > limits functionality. If this is correct: > http://en.wikipedia.org/wiki/USB_mass_storage_device_class > , it is impossible to avoid this conversion in common case. Thanks for the link! I guess my next external HDD will have an eSATA interface then :/ Cheers, Ulrich Spörlein -- http://www.dubistterrorist.de/
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