Date: Mon, 29 Jun 2009 11:12:25 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Scott Long <scottl@samsco.org> Cc: Alexander Motin <mav@freebsd.org>, freebsd-current@freebsd.org Subject: Re: RFC: ATA to CAM integration patch Message-ID: <20090629161225.GJ76275@dan.emsphone.com> In-Reply-To: <4A48DCDF.9010104@samsco.org> References: <4A4517BE.9040504@FreeBSD.org> <200906271419.49329.pieter@degoeje.nl> <4A464EED.3070700@FreeBSD.org> <4A465F8C.4030901@samsco.org> <20090629105556.GB72094@acme.spoerlein.net> <4A48DCDF.9010104@samsco.org>
next in thread | previous in thread | raw e-mail | index | archive | help
In the last episode (Jun 29), Scott Long said: > 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? > > The possibility depends on several hardware and software factors. If the > USB disk enclosure was speaking ATA all the way up to the umass driver, > then it could be possible to add some extra intelligence to the driver to > make SMART work. However, if the enclosure chip is speaking anything > else, then probably not. As an alternative, you might try to the ata-usb > module instead and see if that works. It also depends heavily on which USB bridge chip is in your external enclosure. See these links for a table of known good/bad enclosures: http://smartmontools.wiki.sourceforge.net/USB http://smartmontools.wiki.sourceforge.net/overview_USB-Support -- Dan Nelson dnelson@allantgroup.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090629161225.GJ76275>