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RE: [linux-lvm] LVM and multiple HBA ports



The MD multipath solution works only sometimes. Unplugging the active path
during data transfer hanged the system. 
Unplugging between data transfers works fine, but this is hardly real world.

Seems like there's some work on the multipath issue in 2.6, but 2.4 really
lacks a working solution.

Does anyone have experience with qlogic driver multipath support? Any idea
how to activate it programatically (not using their JAVA GUI).

Dan

> -----Original Message-----
> From: Franc Carter [mailto:franc mml usyd edu au]
> Sent: Monday, April 26, 2004 4:15 AM
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] LVM and multiple HBA ports
> 
> 
> 
> 
> They way I have handled this is to use an md multipath device 
> to combine the
> two luns that are seen in to one md device, and then put lvm on top of
> that.
> 
> Seems to work well - however testing 'real' failures rather 
> than capable
> pulling is somewhat more difficult/risky
> 
> On Wed, Apr 21, 2004 at 07:04:13PM +0300, 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
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm redhat com
> > https://www.redhat.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
> -- 
> Franc Carter     Ph:61-2-8374-5071      Fax: 61-2-8374-5070
> Systems Manager, SIRCA Ltd              http://www.sirca.org.au/
> 
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