Date: Mon, 15 Aug 2005 10:31:27 -0400 From: Scott Long <scottl@samsco.org> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: SAS controllers and SATA tunneling Message-ID: <4300A73F.7080105@samsco.org> In-Reply-To: <4300A637.4030807@freebsd.org> References: <43005F30.9000102@freebsd.org> <4300A2F8.5050207@samsco.org> <4300A637.4030807@freebsd.org>
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Andre Oppermann wrote: > Scott Long wrote: > >> Andre Oppermann wrote: >> >>> Does one of our SCSI-SAS controllers support multiplexors and >>> SATA tunneling (STP)? >>> >> >> No. Adding a SAS module to the MPT driver is probably the easiest >> option by far. SAS chips from Adaptec, Intel, Vitesse, and others >> likely do not have a FreeBSD driver nor the available documentation to >> write a FreeBSD driver. > > > Oops, how does our future look then? Are we going to be restricted to > SATA? I'd say in 2006 all new servers will be SAS-only. Old parallel > SCSI is dead. > Like I said, the mpt driver will be fairly easy and straight forward to add SAS and STP front ends. Their chips are also likely to be very decent. It's up to Vitesse/Adaptec whether or not they want to be relevant, though I guess that they won't care and it'll come down to someone slogging through a linux driver (if one is even released) to reverse engineer it. Intel is somewhat of an unknown quantity, though my guess is that you'll see what amounts to a winmodem-like chip that requires a huge complex driver. Another option would be to do what I wanted to do last year with extending the NDIS wrapper to cover Storport (and whatever the Longhorn follow-on is) so that Windows drivers can be used. Scott
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