From owner-freebsd-current@FreeBSD.ORG Fri Apr 23 14:28:30 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4979D106564A; Fri, 23 Apr 2010 14:28:30 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from ey-out-2122.google.com (ey-out-2122.google.com [74.125.78.26]) by mx1.freebsd.org (Postfix) with ESMTP id 79E818FC15; Fri, 23 Apr 2010 14:28:29 +0000 (UTC) Received: by ey-out-2122.google.com with SMTP id d26so685557eyd.9 for ; Fri, 23 Apr 2010 07:28:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :x-enigmail-version:content-type:content-transfer-encoding; bh=xZyCXifGH87KBPSB7uMBJyj8ErXLoipDhHjX6ajDJhg=; b=rsNRPjNiYPITnbEazNF2O0Uy6Ea7i8sGkzB2g9DsQB++7OlgwF0bHobyJXtK7NnbEw gyLRrjuB2fv4AvOQKBb1xofLzTYo270q6Vf3DEFdkQR7pe6S6DxYN0NoRoneD2qAo9so kXoZkyn1Ql3QCoaw5Z3YiLuRsBQ4q21f0dyXQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; b=GRyVCtgSO3zMLwx0v/ZUTILAp3DpHHl5G2pQaCUxindvEmhF/+/6RDNC6uoAhKwE+v k9KpMcG//ZvKe7mx0c0g5s7WGhe6o0KUqGiSMyNftXleVPkfDuTsagjt6ZLlYrvKds5y mRGMr3d5L/nLAeDayPhd0y/KGuyjO9Cd5LdhM= Received: by 10.102.243.26 with SMTP id q26mr70937muh.34.1272032907941; Fri, 23 Apr 2010 07:28:27 -0700 (PDT) Received: from mavbook.mavhome.dp.ua (pc.mavhome.dp.ua [212.86.226.226]) by mx.google.com with ESMTPS id y6sm4751902mug.50.2010.04.23.07.28.26 (version=SSLv3 cipher=RC4-MD5); Fri, 23 Apr 2010 07:28:27 -0700 (PDT) Sender: Alexander Motin Message-ID: <4BD1AE7F.2060907@FreeBSD.org> Date: Fri, 23 Apr 2010 17:28:15 +0300 From: Alexander Motin User-Agent: Thunderbird 2.0.0.24 (X11/20100402) MIME-Version: 1.0 To: John Baldwin References: <4BD06BD9.6030401@FreeBSD.org> <201004230950.33999.jhb@freebsd.org> In-Reply-To: <201004230950.33999.jhb@freebsd.org> X-Enigmail-Version: 0.96.0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Switchover to CAM ATA? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Apr 2010 14:28:30 -0000 John Baldwin wrote: > On Thursday 22 April 2010 11:31:37 am Alexander Motin wrote: >> If ataraid(4) should be reimplemented in GEOM, then how exactly? One >> more separate RAID infrastructure in GEOM (third?) looks excessive. >> Reuse gmirror, gstripe,... code would be nice, but will make them more >> complicated and could be not easy for RAID0+1 (due to common metadata) >> and RAID5 (due to lack of module in a base system). > > Scott's view (which sounds good to me) is that GEOM should include a library > of routines for working with common transforms such as RAID1, striping, etc. > Each ATA RAID vendor format would then consist of a small GEOM module that > used the library routines to manage all the I/O and the bulk of the module > would be managing a specific metadata format. Yes, I remember he proposed it somewhere. Idea is fine. Somebody with sharp axe and lack of fear should just chop half of GEOM modules into small pieces and collect them back. ;) -- Alexander Motin