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





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


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



-----Urspr√ľngliche 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: [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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