[linux-lvm] LVM Multi Path Support

[Franc Carter]

Ahh, that makes sense (the undefined first PV) and explains
why the 'current-controller' is not the 'default-controller'
for one of the LUNs

It doesn't seem to matter if it uses the other device. I think it
just causes the array to do a tresspass and swap controllers. The
downside being that I can't reliably balance the I/O across the
two controllers. But that's not catastrophic.

I'm using lvm1, which I don't beleive has an lvm.conf - correct ?

thanks


On Fri, Mar 05, 2004 at 09:07:41AM +0000, Joe Thornber wrote:
> On Fri, Mar 05, 2004 at 11:12:38AM +1100, Franc Carter wrote:
> > LVM appears to do the 'right thing for me' in that it recognises
> > that the the two PVs are one (I assume via the UUID) and ignore
> > the second LUN.
> 
> Yes, LVM writes a label to the start of a PV to identify it.
> 
> > I'd like to know if this is just good luck, or if it's behaviour
> > I can rely ?
> 
> I don't think it's defined which of the 2 devices LVM will choose,
> does this matter ?  If so you could always set up a filter in lvm.conf
> to remove one (probably advisable anyway).
> 
> - Joe
> 
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-- 
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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