[linux-lvm] SAN setup with host mirrored disks
ksauke at fastenal.com
Thu Jul 13 18:03:34 UTC 2006
Michael Loftis wrote:
> --On July 13, 2006 12:04:01 AM +0200 "Fiederling, Daniel"
> <daniel.fiederling at warema.de> wrote:
>> I'm relatively new to SAN setup with linux boxes, so maybe this is a
>> 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
>> 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
> into trouble of all kinds."
> -- Samuel Butler
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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