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





Michael Loftis wrote:


--On July 13, 2006 12:04:01 AM +0200 "Fiederling, Daniel" <daniel fiederling warema de> wrote:


Hi,

I'm relatively new to SAN setup with linux boxes, so maybe this is a very
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 /dev/sdb)
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 possessors
into trouble of all kinds."
-- Samuel Butler

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