From owner-freebsd-hardware@freebsd.org Mon Aug 14 04:55:29 2017 Return-Path: Delivered-To: freebsd-hardware@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 71B16DD3C53 for ; Mon, 14 Aug 2017 04:55:29 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) Received: from smtp.rcn.com (smtp.rcn.com [69.168.97.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3B2866CB8D for ; Mon, 14 Aug 2017 04:55:28 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) X_CMAE_Category: , , X-CNFS-Analysis: v=2.2 cv=Aa3zJDfG c=1 sm=1 tr=0 a=lGUdY1O6J9NpztYPi32J9g==:117 a=lGUdY1O6J9NpztYPi32J9g==:17 a=r77TgQKjGQsHNAKrUKIA:9 a=wFqjuZecNA2Q0zH28JwA:9 a=5tuCPvN-1RKcjjiR:21 a=qRXdMHl097A7n0ZI:21 a=QEXdDO2ut3YA:10 a=uecSUABJW_AA:10 a=DYuDYreJR4hht5VXJo0A:9 a=YoMO8FQamdjw0kmD:21 a=_W_S_7VecoQA:10 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine X-Authed-Username: YW5hdEByY24uY29t Authentication-Results: smtp02.rcn.cmh.synacor.com header.from=mi+thun@aldan.algebra.com; sender-id=neutral Authentication-Results: smtp02.rcn.cmh.synacor.com smtp.mail=mi+thun@aldan.algebra.com; spf=neutral; sender-id=neutral Authentication-Results: smtp02.rcn.cmh.synacor.com smtp.user=anat; auth=pass (PLAIN) Received-SPF: neutral (smtp02.rcn.cmh.synacor.com: 108.53.87.28 is neither permitted nor denied by domain of aldan.algebra.com) Received: from [108.53.87.28] ([108.53.87.28:28059] helo=aldan.narawntapu) by smtp.rcn.com (envelope-from ) (ecelerity 3.6.23.54417 r(Core:3.6.23.0)) with ESMTPSA (cipher=DHE-RSA-AES128-SHA) id D1/01-53214-83D21995; Mon, 14 Aug 2017 00:55:20 -0400 To: freebsd-hardware@FreeBSD.org From: "Mikhail T." Subject: ada vs. da? Message-ID: <2c0b1d32-bc9b-26e7-4c51-46bc6a2af40d@aldan.algebra.com> Date: Mon, 14 Aug 2017 00:55:20 -0400 MIME-Version: 1.0 Content-Language: en-US Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Aug 2017 04:55:29 -0000 The four AHCI-drives in my system appear as both adaX and daX each: at scbus2 target 0 lun 0 (ada1,pass2) at scbus3 target 0 lun 0 (ada2,pass3) at scbus5 target 0 lun 0 (ada3,pass4) at scbus6 target 0 lun 0 (ada4,pass5) at scbus7 target 0 lun 0 (da0,pass6) at scbus7 target 0 lun 1 (da1,pass7) at scbus7 target 0 lun 2 (da2,pass8) at scbus7 target 0 lun 3 (da3,pass9) Each one is listed in /var/run/dmesg.boot like this: ada2: ATA8-ACS SATA 3.x device ada2: Serial Number Z1F1E8NK ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada2: Command Queueing enabled ada2: 2861588MB (5860533168 512 byte sectors) ada2: quirks=0x1<4K> ada2: Previously was known as ad8 da2: Removable Direct Access SPC-3 SCSI device da2: Serial Number 000000000195 da2: 40.000MB/s transfers da2: Attempt to query device size failed: NOT READY, Medium not present da2: quirks=0x3 What am I supposed to make of it? Can they be accessed through either name? What are the advantages of each? If ada is always a better choice, how do I make the da ones disappear -- such as from the systat's output? Thanks! -mi