[dm-devel] Round Robin vs Active/Passive

[Hannes Reinecke]

Hi Domenico,

On Thu, May 22, 2008 at 10:24:52AM +0200, Domenico Viggiani wrote:
> * Tore Anderson
> >
> > path_grouping_policy group_by_prio
> > prio_callout "/sbin/mpath_prio_emc_silent /dev/%n"
> > 
> > (This is an EMC array.)
> > 
[ .. ]
> 
> Sorry for question: is this how new ALUA mode works for EMC Clariion CX
> arrays?
> Are default settings suitable for this new failover mode?
> 
> I just upgraded my CX700 to FLARE26 with ALUA mode...
> 
No. Alua is completely different. You have to use

prio_callout "/sbin/mpath_prio_alua /dev/%n"

for this.
Although the normal EMC configuration continues to work, too.
And also note that you have to change the failover mode
to '4' to enable ALUA on the Clariion.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
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