[linux-lvm] LVM and multiple HBA ports

[Dan Bar Dov]

I wouldn't call them 'most storage vendors'  rather the 'large vendors'.
 
I'm using an Infortrend (taiwanese vendor) storage controller. They and all
the other small vendors, do not support any multiple path failover drivers
for Linux. Qlogic HBA has some support in their driver, but only if you user
their user mode management software, which I cannot use since they support
only Intel and I'm on PPC. They won't supply any documentatin etc regarding
how to use it programatically.
 
People who use Linux because its not expensive, also use inexpensive
storage. It does not mean they don't want to use advanced features.
 
Dan

-----Original Message-----
From: Yang, Fred [mailto:FYang at nshs.edu]
Sent: Wednesday, April 21, 2004 7:36 PM
To: 'csc at cadence.com'; 'LVM general discussion and development'
Subject: RE: [linux-lvm] LVM and multiple HBA ports



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
<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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