AW: [linux-lvm] SAN setup with host mirrored disks

Michael Loftis mloftis at
Mon Jul 17 17:34:03 UTC 2006

--On July 17, 2006 8:11:17 AM +0200 "Fiederling, Daniel" 
<daniel.fiederling at> wrote:

> 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?

Yeah, don't bother.  It's a kernel module.  No source.  I've tried to get 
them to do the sane thing (wrapper .c with binary lib, like nvidia) so they 
could support other than the specific binary kernels in RedHat but they 
either refused or didn't get it.  When they say Linux they don't mean 
Linux, they mean RedHat.  YMMV but for us RedHat has been nothing but weird 
problems.  Unless you're willing to install and run a RedHat kernel you're 

> 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 at [mailto:linux-lvm-bounces at]
> Im Auftrag von Kelly Sauke Gesendet: Donnerstag, 13. Juli 2006 20:04
> An: LVM general discussion and development
> Betreff: Re: [linux-lvm] 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.
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