Re: Multi-Path MPIO and EMC

Sean,

I'm not sure that is a supported configuration for VIO based disks. I found
the following in the "System p Advanced POWER Virtualization Best Practices"
Redbook.

"The MPIO support of virtual SCSI between client partitions and dual Virtual
I/O Servers only supports failover mode. For any given virtual SCSI disk, a
client partition will use a primary path to one Virtual I/O Server and fail
over to the secondary path to use the other Virtual I/O Server. Only one
path is used at a given time even though both paths can be enabled."

In general, given a dual VIO server environment, I tend to set things up so
that under normal circumstances virtual ethernet traffic runs through one
VIO server and the virtual SCSI traffic runs through the other. Both are
configured for failover so that either VIO server may be taken down for
maintenance without impacting the client LPARs.

Regards,
Keith Stevenson
IBM System Architect


On Feb 13, 2008 10:48 AM, Murphy, Sean <Sean.Murphy@xxxxxxxxxxx> wrote:

Thanks Steve,

the priority is the same for both paths (i.e. vscsi1 and vscsi0 are set to
prioity 1)
However I noticed that the algorithm on the vio server is set to
round_robin.

I guess this means that the load is balanced to each path 50/50.


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