From owner-freebsd-scsi Mon Apr 15 15: 3:40 2002 Delivered-To: freebsd-scsi@freebsd.org Received: from beppo.feral.com (beppo.feral.com [192.67.166.79]) by hub.freebsd.org (Postfix) with ESMTP id B636D37B400 for ; Mon, 15 Apr 2002 15:03:37 -0700 (PDT) Received: from mailhost.feral.com (mjacob@mailhost.feral.com [192.67.166.1]) by beppo.feral.com (8.11.3/8.11.3) with ESMTP id g3FM3Zf63612; Mon, 15 Apr 2002 15:03:35 -0700 (PDT) (envelope-from mjacob@feral.com) Date: Mon, 15 Apr 2002 15:03:35 -0700 (PDT) From: Matthew Jacob X-Sender: mjacob@beppo Reply-To: mjacob@feral.com To: "Justin T. Gibbs" Cc: scsi@FreeBSD.ORG Subject: Re: is there a reason that da should *not* drive type STORAGE ARRAY In-Reply-To: <200204152144.g3FLih983892@aslan.scsiguy.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org > > > >Whilst dorking with an HP XP-512 storage arrage array on Fibre Channel, I > >found that it defaults to type STORAGE ARRAY (not DIRECT ACCESS). However, the > >DIRECT ACCESS commands work fine. > > > >Is there a reason why da(4) should *not* drive devices of type STORAGE ARRAY? > > Fear of the unknown. What differentiates a STORAGE ARRAY from any > other DIRECT ACCESS device? Is the assumption that they are essentially > the same always valid? Gee- I dunno. I've never really played with one. The spec (SCC2) is a bit ambiguous- it appears to support all the commands you'd want for a DIRECT ACCESS device (but does not explicitly list READ(6,10), WRITE(6,10) or FORMAT)- but also says: The model assumes all the SCSI peripheral devices controlled withuin a SCSI storage array are either fixed block or variable block devices. Considering that the only STORAGE ARRAY type devices I know of are disk devices, I'd say it's *moderately* safe to assume that da(4) should drive them. Let's say that it accrues better to FreeBSD to drive them out the door then mis-drive a device that nobody has seen yet ;-). -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message