From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k6DI3gpQ005568 for ; Thu, 13 Jul 2006 14:03:42 -0400 Received: from will.fastenal.com (will.fastenal.com [205.243.112.23]) by mx1.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k6DI3dGC015769 for ; Thu, 13 Jul 2006 14:03:39 -0400 Message-ID: <44B68AF6.30004@fastenal.com> Date: Thu, 13 Jul 2006 13:03:34 -0500 From: Kelly Sauke MIME-Version: 1.0 Subject: Re: [linux-lvm] SAN setup with host mirrored disks References: <7CA7BBF7F95AA245ACAB8E28A6285EB905191D94@s01edv50.warema.de> In-Reply-To: Content-Transfer-Encoding: 7bit Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Michael Loftis wrote: > > > --On July 13, 2006 12:04:01 AM +0200 "Fiederling, Daniel" > wrote: > >> >> Hi, >> >> I'm relatively new to SAN setup with linux boxes, so maybe this is a >> very >> easy question. Today I set up a linux box with two qlogic hbas, each one >> is connected to a EMC Clarion. So I got two disks (/dev/sda and >> /dev/sdb) >> from my storages that I have to mirror on the host system. There is on >> mirror set up in the san environment! > > Uhhhmm...Clariion Can and does do RAID 0,1,5, as well as any > combination of the three. Depending on the model of Clariion and your > specific setup (esp depending on if you're using powerpath or not) > you'll see one or two 'copies' of each LUN. > > In fact I'd highly recomment using the Clariion to do all of your real > RAID stuff, and if you can't use powerpath, then use md *just* for > failover. You do not need MD for actual RAID with a Clariion. > Navisphere will allow you to configure mirrors of sets of drives. > > Do the Raiding on the Clariion. Then use either PowerPath or mpio (on RHEL 4 U3 or newer) to do your failover. If you use md for your failover layer you may get IO errors on the non-active paths. You need something that is aware of the clariion setup and that would be PowerPath or the shipped mpio. > > > -- > "Genius might be described as a supreme capacity for getting its > possessors > into trouble of all kinds." > -- Samuel Butler > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/