From owner-freebsd-questions@FreeBSD.ORG Sun Jan 25 19:15:23 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 85A48106568A for ; Sun, 25 Jan 2009 19:15:23 +0000 (UTC) (envelope-from omerfsen@gmail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.154]) by mx1.freebsd.org (Postfix) with ESMTP id 18A9C8FC18 for ; Sun, 25 Jan 2009 19:15:22 +0000 (UTC) (envelope-from omerfsen@gmail.com) Received: by fg-out-1718.google.com with SMTP id l26so3956218fgb.35 for ; Sun, 25 Jan 2009 11:15:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type:content-transfer-encoding; bh=/GOtNEWeN8+Q1Yab2reIy2O3bKxErYSL78H/e2Have0=; b=I6b4yD1/+gmcyc6Qch8nnbjkXoOWy2S3ExueWdetN9+v/R9+oSJ4AE2XEG9Ue27gJk B0i7BrqM8qipT/nr4e0/WDXdDKGGVQY7BsdiOSToY+6aoSl7Iy/oBo7tY4wU+3ooEZhA Nmi2lo9acEO22OxtOqk9H2r1/5wei1RxVsM10= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; b=m5wJDlCCwXQiSmcUKPFa9patoUKwmRj5DB2wc1YsnaCqZnVqwWs6FRYQ+tIovzTRF+ jvhkehSSI6kYVXYlzwTmY53f9zMGtdgdQdLJPCR8Tx7TKY2woMI1u9QY5Iln/qu7D3qg z4WChzFAgrft1QwVKgJsrexU6hg3BdmirWLQE= MIME-Version: 1.0 Received: by 10.86.25.17 with SMTP id 17mr961051fgy.57.1232908954066; Sun, 25 Jan 2009 10:42:34 -0800 (PST) Date: Sun, 25 Jan 2009 20:42:34 +0200 Message-ID: <75a268720901251042p67515b92kda61bc875dcdab97@mail.gmail.com> From: Omer Faruk Sen To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: atacontrol software or hardware raid X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Jan 2009 19:15:23 -0000 How can I detect if system has Software or hardware raid? Since in manual page: The atacontrol command can also be used to create purely software RAID arrays in systems that do NOT have a "real" hardware RAID card such as a Highpoint or Promise card. A common scenario is a 1U server such as the HP DL320 G4 or G5. These servers contain a SATA controller that has 2 channels that can contain 2 disks per channel, but the servers are wired to only place a single SATA drive on each channel. Or how can I find out if the hardware is "real" hardware RAID card? For example my system has following dmesg output: ad4: 152627MB at ata2-master SATA300 ad6: 152627MB at ata3-master SATA300 ar0: 152625MB status: READY ar0: disk0 READY (master) using ad6 at ata3-master ar0: disk1 READY (mirror) using ad4 at ata2-master This system is an intel server with S3210SH server board in it. While installing system I see ad4,ad6 and ar0 as harddrives in sysinstall. I choose to install ar0. Additionally as far as I see ar0 is very susceptible to errors since a single CRC error can break the RAID consistency is that normal? I really appreciate those who uses such a kind of RAID1 Regards.