AW: [linux-lvm] SAN setup with host mirrored disks
mloftis at wgops.com
Mon Jul 17 17:34:03 UTC 2006
--On July 17, 2006 8:11:17 AM +0200 "Fiederling, Daniel"
<daniel.fiederling at warema.de> wrote:
> 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...
> -----Ursprüngliche Nachricht-----
> Von: linux-lvm-bounces at redhat.com [mailto:linux-lvm-bounces at redhat.com]
> 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.
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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