From owner-freebsd-hardware@FreeBSD.ORG Fri Apr 4 11:50:45 2014 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B0422A19; Fri, 4 Apr 2014 11:50:45 +0000 (UTC) Received: from mail-wi0-x233.google.com (mail-wi0-x233.google.com [IPv6:2a00:1450:400c:c05::233]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A92A41F0; Fri, 4 Apr 2014 11:50:44 +0000 (UTC) Received: by mail-wi0-f179.google.com with SMTP id z2so1078918wiv.0 for ; Fri, 04 Apr 2014 04:50:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:message-id:date:from:user-agent:mime-version:to:subject :content-type:content-transfer-encoding; bh=BVhoXrnUqZGR+87p9ZA/ViHaHUS/C8hS0hrWuMqrFdA=; b=dstro1iSsvIAx34SW4TRKDFGQYmYlqDYVg8TbcZEILrCgWhfArVe/0Fy5DjfR5TjPH 2hePW75JFpQfyXKKTHtfs0v60p+IdtKHqAq/Ro2jxZI+mTOroVUzypnN95rb7LnU+f0l ZOyEfD8qWNyonFc0sbQgasXA2MxXCDtPCaoWJS3vPTzNB8eVvklG5M92gQVizu9QVDkV HCreoriadPWSFakKpCi12w2jhDYEuwEN9ua6fOq+LYXBATCwxqneVX0qqASuavfeMuUI QO159o3IyuAecankQaTpYlynlYvg3MM1nAoCtk3L6lckYJMb+c4fwSKQOL1PP8CmR7Vj ufXw== X-Received: by 10.194.82.69 with SMTP id g5mr19148804wjy.85.1396612242946; Fri, 04 Apr 2014 04:50:42 -0700 (PDT) Received: from mavbook.mavhome.dp.ua ([134.249.139.101]) by mx.google.com with ESMTPSA id y51sm19074307eeu.0.2014.04.04.04.50.40 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 04 Apr 2014 04:50:41 -0700 (PDT) Sender: Alexander Motin Message-ID: <533E9C8F.20005@FreeBSD.org> Date: Fri, 04 Apr 2014 14:50:39 +0300 From: Alexander Motin User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: FreeBSD SCSI , FreeBSD Hardware Subject: Are there still cd(4) changers? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Apr 2014 11:50:45 -0000 Hi. Does anybody still use CD changer supported by cd(4) driver in FreeBSD, not ch(4)? Those changers have single drive, but report multiple LUNs with one LUN per CD slot. One device like I have in my table is 17 year old. All devices I can find with Google or eBay are CD, not even DVD, and are parallel ATA or parallel SCSI. Is there anything relevant still on market? I am asking this because code supporting that hardware in FreeBSD is heavily broken in head and stable/10 branches for several months now, and fix seems to be non-trivial. So my question is: does it worth bothering with rewrite, or we can just drop ~20KB of unused and quite complicated code? Dropping code does not mean those devices will be unusable, but only that _simultaneous_ access to different LUNs will become much slower due to inefficient scheduling of disk loads/unloads. -- Alexander Motin