From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Dilger Subject: Re: [PATCH] blkid: optimize dm_device_is_leaf() usage Date: Tue, 26 Aug 2008 13:44:45 -0600 Message-ID: <20080826194445.GN3392@webber.adilger.int> References: <1219697316-5632-1-git-send-email-kzak@redhat.com> <20080826122405.GA8720@mit.edu> <20080826135102.GK6029@nb.net.home> <20080826144721.GD8720@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7BIT Cc: Karel Zak , linux-ext4@vger.kernel.org, Eric Sandeen , mbroz@redhat.com, agk@redhat.com To: Theodore Tso Return-path: Received: from sca-es-mail-1.Sun.COM ([192.18.43.132]:41259 "EHLO sca-es-mail-1.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753694AbYHZTot (ORCPT ); Tue, 26 Aug 2008 15:44:49 -0400 Received: from fe-sfbay-10.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id m7QJim7l000071 for ; Tue, 26 Aug 2008 12:44:48 -0700 (PDT) Received: from conversion-daemon.fe-sfbay-10.sun.com by fe-sfbay-10.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0K6800D0144Z5200@fe-sfbay-10.sun.com> (original mail from adilger@sun.com) for linux-ext4@vger.kernel.org; Tue, 26 Aug 2008 12:44:48 -0700 (PDT) In-reply-to: <20080826144721.GD8720@mit.edu> Content-disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: On Aug 26, 2008 10:47 -0400, Theodore Ts'o wrote: > I don't think you mean multipath support in terms of where there are > multiple paths to the same physical device ala fiber channel, but > rather where are multiple devices which are built on each other, > right? So where /dev/sda is used to create the LVM PV's, and so on, > right? No, in fact DM has actual mutliple-paths-to-the-same-device support, via "dm-multipath". Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc.