SVC to PowerVM NPIV SAN Zoning Best Practices

From Ernie O. and Chuck L of IBM…

Please do not contact the author on this but raise any concerns on this paper through your IBM Storage Support channel.

                                                                                                                                      

I have always considered 8 NPIV paths/zones, each with a single initiator and single target, to be the best configuration for performance and availability.

Most vendors Path Control Modules recommend 8 paths for performance and, properly cabled, 8 paths also allows for a concurrent failure on one of the SAN Fabrics (assuming 2) as well as one of the VIO servers, (assuming 2).

However, the SVC using SDDPCM has 4 paths as it’s optimal number for performance.  If you use 8 paths, and LPM a partition, the SVC has to manage 16 paths during the LPM move and this has resulted in a failed LPM move, with data loss, resulting in a reload of the partition.

 

Click for detailed diagrams .pdf —–>  SVC zoning for PowerVM NPIV

 

Please do not contact the author on this but raise any concerns on this paper through your IBM Storage Support channel.