From owner-freebsd-scsi@FreeBSD.ORG Fri Mar 26 08:28:02 2010 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7EB7F106566B for ; Fri, 26 Mar 2010 08:28:02 +0000 (UTC) (envelope-from omerfsen@gmail.com) Received: from mail-fx0-f225.google.com (mail-fx0-f225.google.com [209.85.220.225]) by mx1.freebsd.org (Postfix) with ESMTP id 168E38FC16 for ; Fri, 26 Mar 2010 08:28:01 +0000 (UTC) Received: by fxm25 with SMTP id 25so100488fxm.3 for ; Fri, 26 Mar 2010 01:28:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:received:message-id :subject:from:to:content-type; bh=QrQYxM9dN47oo5e0+Z9seiq1Uj+26FpRgL6pqg337ZQ=; b=uMQV3yxz3RbUMWdIvcwIUMQtpU5aaguWP9fNg5zlFRJCmd7Qz5IpOvi3yKQe1lJQgi e8Y/GoP46aLB2VG7fXuBTvMik/g94TulwMkKnj/5yZ4aKnTHxHKNgorOCQmQ5ecrYkPT DVu2hPjO4M9LcVSc7SDJSJO74NXoLw+//vxS8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=qBXUiJba6PcxUzp+iUIF8UZTGovlVrV2BTWlUXVQ8PhnG0U4d2zQtXOSRIpt7AKazZ hFmg7CxMYCutSrTPW+SdmdZFnDeuzfz6uqWByIrFGPO7DmjIO6yXUx2TVKLuhxd4Uh22 e+xqYGuLuYrzq5n9PpoOzP6RyhtAlHRnuaE6U= MIME-Version: 1.0 Received: by 10.239.159.8 with HTTP; Fri, 26 Mar 2010 01:27:59 -0700 (PDT) Date: Fri, 26 Mar 2010 10:27:59 +0200 Received: by 10.239.166.10 with SMTP id z10mr57304hbd.80.1269592079413; Fri, 26 Mar 2010 01:27:59 -0700 (PDT) Message-ID: <75a268721003260127o4de50576m512862545fae292d@mail.gmail.com> From: Omer Faruk Sen To: freebsd-scsi@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Subject: Asymmetric logical unit access(ALUA) and FreeBSD X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Mar 2010 08:28:02 -0000 I want to know if FreeBSD supports Asymmetric logical unit access ? >From http://www.vicengle.org/san/dmp.php ALUA, Asymmetric logical unit access ALUA is a relatively new multipathing technology for asymmetrical arrays. If the array is ALUA compliant and the host multipathing layer is ALUA aware then virtually no additional configuration is required for proper path management by the host. An Asymmetrical array is one which provides different levels of access per port. For example on a typical Asymmetrical array with 2 controllers it may be that a particular LUN's paths to controller-0 port-0 are active and optimized while that LUN's paths to controller-1 port-0 are active non-optimized. The multipathing layer should then use paths to controller-0 port-0 as the primary paths and paths to controller-1 port-0 as the secondary (failover) paths. Sun Solaris 10 MPxIO is an example of an ALUA aware multipathing solution. A Netapp FAS3020 with Data ONTAP 7.2.x is an example of an ALUA compliant array. Regards.