From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3991C64D.7F787704@geotec.net> Date: Wed, 09 Aug 2000 15:59:58 -0500 From: Eric Smith MIME-Version: 1.0 Subject: Re: [linux-lvm] dual adapter machine References: <31A612FE6020D2119F6400A0C9B67EBB0381B27A@FTHW901E> Content-Transfer-Encoding: 7bit Sender: owner-linux-lvm Errors-To: owner-linux-lvm List-Id: Content-Type: text/plain; charset="us-ascii" To: Franken Klaus Cc: 'Michael Lausch' , linux-lvm@msede.com I think LVM should be made to do it. Veritas calls theirs DMP: Dynamic Multi Pathing. What's cool is, not only do you eliminate your single point of failure. but also DMP round-robins requests between the two paths when both are active, increasing your throughput. LVM should do this, imho! Franken Klaus wrote: > Hi, > > there is a commercial software called "Duplex Data Manager (DDM)" from > Fujitsu-Siemens-Computers for exactly this. > Unfortunately I can't found an online documentation. > I can send you a PDF and a powerpoint ducumentation if needed. > In the german magazin "Linux Enterprise" (1.2000) was an article about DDM. > > DDM seems very well designed, you can use it in conjunction with MD, LVM etc. > > But an open-source tool would be nice too. > > Klaus.Franken@fth2.siemens.de +49 911 978 3707 > Siemens Business Services IP 21F > > > -----Original Message----- > > From: Michael Lausch [mailto:mla@1012surf.net] > > Sent: Monday, August 07, 2000 12:33 PM > > To: linux-lvm@msede.com > > Subject: [linux-lvm] dual adapter machine > > > > > > > > We are going to use linux LVM on some servers using 2 FCAL adapters > > per machine, since our RAID System (HP XP256) has two FCAL > > channels. So in order to have no single point of failure, we want to > > use 2 FCAL adapters in each machine, connected to the same (virttual) > > disks. This means i see the same partition on two controlers. > > > > For example: controller 1, SCSIID 3, LUN 1, Partition 1 > > and controller 2, SCSIID 3, LUN 1, Partition 1 > > > > refer to the same blocks. > > > > So when everything is okay i'll talk to the disk through c1d3l1s1 (in > > solaris notation). When this FCAL has an error, i want to talk to the > > same disk via c2d3l1s1. How can this be done with linux LVM? > > > > Anybody got any ideas? > > > > thanks in advance. > > -- > > michael lausch > >