[linux-lvm] LVM and multiple HBA ports

[Yang, Fred]

What storage you are using? Most storage vendor has their own multi path
software, e.g. EMC's powerpath, IBM's SDD. We are using IBM ESS, and we just
use the vpath device to create PV, the SDD actually do the load
balancing&failover between multiple path.

-Fred

-----Original Message-----
From: linux-lvm-bounces at redhat.com [mailto:linux-lvm-bounces at redhat.com] On
Behalf Of Chris Croswhite
Sent: Wednesday, April 21, 2004 12:17 PM
To: LVM general discussion and development
Subject: Re: [linux-lvm] LVM and multiple HBA ports

Is this a multipathed device?  I first create an MD device of a particular
lun like this:
mdadm -C -f -l mp -n 1 -x 1 /dev/md0 /dev/sd<x> /dev/sd<y>

where x is channel A of the device and y is channel B.

You can then verify it by:
mdadm --detail /dev/md0

Does this help?

On Wed, 2004-04-21 at 09:04, Dan Bar Dov wrote:
> I have a problem using two (or more) ports connected to the same storage.
> 
> Linux does not identify that the two LUNs it discovers is actually the
same.
> When I create a PV all is well. 
> The PV gets created and is ACTIVE. However, through the other port, 
> the PV is also discovered, but is marked INACTIVE in the LVM database.
> 
> When I try to create a VG using the active path, LVM scans all PVs in
order.
> If it finds the INACTIVE instance first, the VG creation fails.
> 
> I'm using LVM 1.0.3, please let mw know if such a situation 
> (connecting storage through multiple ports) is handled better in 
> another version, or suggest how to overcome the problem.
> 
> Thanks,
> Dan
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