Hi, thank you all for your answers. I currently test a setup with md for failover. To clarify: we have two Clariions in two different locations that are used for failover. Of course on each Clariion the disks are set up as raid 5. My question was about setting up a mirror that "copies" the data on each Clariion. Currently I use OpenSuSE 10.1 as distribution so unfortunately I can't use PowerPath because I only get rpms for sles or rhel that can't be installed. I know it's the wrong place for this question but: had someone success on installing PowerPath on non supported systems? Kelly, I installed a package called multipath-tools version 0.4.6 which contains multipath and multipathd by Christophe Varoqui. Is that the mpio package you mentioned? Why do I have to expect io errors when using md? What is special about the Clariion setup? I would expect that the san disks are only "normal" scsi disks for linux... Ciao Daniel -----Ursprüngliche Nachricht----- Von: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] Im Auftrag von Kelly Sauke Gesendet: Donnerstag, 13. Juli 2006 20:04 An: LVM general discussion and development Betreff: Re: SAN setup with host mirrored disks 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. _______________________________________________ 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/
